Using nitrogen in flowering to correct yellowing, not workiing?

Two weeks ago on a sunday flushed the pot that holds a 4-5ft outdoor sativa dominant plant, topped 3 times like:
VV
V
|
which seems to have foliage at the top two Vs (looks much like a tree due to yellowing dropping leaves in the past - either low light as in no need for heaps of leaves, or nitrogen deficiencies) and recieves about 4-5 hours direct sunlight per day.
Pot was flushed because it is showing pistils and changed to bloom nutes. So after flushed i gave full strength "manutec" 6.2-14.6-16.something bloom booster and a slight amount of epsom salts and chucked some crushed egg shells into the soil. On the Tuesday fed full strength charlie carp 9-2-6 fish emulsion because bottom leaves were showing signs of n deficiency. All top leaves seemed to get a little bit darker but still very healthy, and lots of new growth at the top appeared (growing taller with lots of side branches like flower feeders or watever coming out at the tops). Problem is very bottom leaves kept turning pale yellow, eventually dropping off. The large fan leaves above them (about 3-4 on the same sort of level on different stems) began to turn light green and i just know they will turn yellow.

So the sunday just gone fed with full strength bloom booster again (as directed once weekly) and in the watering can also gave it 1/5 of charlie carp (one capful in 5 litres). Yesterday on tuesday i gave full strength (one capful to one litre where as the full strength i gave last tuesday was 3 capfuls to three litres so same ratio) to correct these bottom leaves that are pale green (one of them is yellow now) are getting slightly worse, so these hits of nitrogen arent correcting anything. I dont want to go harder on the N because its like 2 weeks into flowering still only showing minimal pistils.. maybe N has delayed flowering because other plant is quite a bit more developed but people have said its more genetic or what ever.

So these leaves are presenting exactly like a N deficiency.. not intervienal chlorosis but the leaf and leaf stem turns pale yellow and drops off.

Could this be that plant only needs certain amount of light due to not much direct sun (i doubt it)???? Could it be that the soil has slightly poor drainage, or that the pot is always in shade (its in a green house) and a week after watering the soil is still damp??

Cant be any other deficiency besides N due to bloom booster....

thanks for any replies

oh and the tips of some of the leaves are slighly yellow so there is only a slight slight excess of nutrience. In other words unless a nitrogen deficient leaf shows EXACTLY like an over fed leaf, its not over feeding.

Leaves are also quite large in areas which would point to not under light issue?

it might not even be a problem but i have to go into detail for you to get an idea

Pic's always give us a better idea of what your seeing. If your plants are 4-5 foot tall the lower leaves are not getting the light they need. Also it sounds like your overwatering them. If the leaf is on the lower 1/3 of the plant it should be trimed anyway. You need the bottem third clear to get fresh air up under the canopy. Do you have a fan on them? If their only getting 4-5 hours of direct light how much are they getting all to gether? Are you giving them any artificial light? I'd watch your nutes, it sounds like your mixing quite a potion. You don't want to see an overnute problem, by then it has already done some damage. Let your soil dry out for an extra 2 days this time and see if it droops, if not, your overwatering. It sounds like you have it under control if they are that big, good luck......

well, firstly iv found that it doesnt need water really more than once a week as i said before due to shaded pot or slightly poor drainage? Iv been watering twice a week the past two weeks each time iv fed with nutes as described above. before that i wouldnt even give it water for 2 weeks on end maybe longer and it was fine... so all in all for most people that would be underwatering, so maybe for me it is over watering but twice a week seems about the norm? but iv been told overwatering needs to be crazy overwatering before leaves turn yellow.

I normally dont like giving much nutrient but before i flushed the medium like 4 weeks ago etc i was feeding 1/3rd strength etc and plant was too light and yellowing.

The veg nute charlie carp that im using is an organic fish emulsion 9.2.6 and its not very strong, as i said the tips are slightly off colour meaning there is a slight excess. iv found i can use a whole lot of it where as the other stuff i used to have id be 3 mls off and it would burn the plant.

The green house is like a small plastic shitty one 4ft by 5 ft, and it gets 4-5 hours of direct sunlight and then the rest of the hours that make up the day of shade once the sun disappears over the house.

5 gallon or round about pot btw

if tips are yellow then its nute burn or ph is wrong,,,,you dont need to flush before you flower and you dont need to give full strength nutes,,i never give more than 3/4 strength,eventhough it recommended i give full strength,the last time i did that my plants got nute burned,,,,,peace

oh and i always give 1/4 strength vegging nutes even when flowering,,for about 3weeks then i just give bloom nutes and additives,,,,,peace