Switching from veg to flower, any tips or suggestions?

few pics of where im at below... I thought I would switch my plant to flower from the first day of 2019. Did all its growing in 2018 and will blossom in 2019. Due to the change in year and the line up of the earths rotation with the magnetosphere this enriches it with absolutely fuck all

First time doing this so at day 6 now and what i can say with certainty is that the plant has stalled and produced little to no new growth other than widening of leaves. Is that the norm?
I haven't changed the nute's from the end of the last veg cycle yet as i thought i would just let it run out for a week or 2 while the plant figured out the change was happening (although i did top up phosphorous slightly).
I was intending to start with a light mix of my bloom nutes when i noticed the stretch starting. right or wrong?
Some defoliation too when i see it take shape.
I have removed all the lst wires, there was a small amount of bounce back but it seems to be mostly staying put, i will attach some grow-yo's to bring colas out as they appear. 5 gals of root ball inside that tub.. the stems are quite sturdy, i hope the flower goes well, humidity is a problem always sitting around 70...
rdwc
pH5.8
19c
i just use a clean mix of nutes A+B, calmag and silica.
Let me know some rookie mistakes to avoid through my first bloom, anything you have learned on the way..
Cheers

will take a couple weeks until you see any noticeable change. depends on the strain too. by two weeks you will notice the stretch but might not have any flower formation.
if you have had nutes in for a couple weeks already, change out and follow the instructions for bloom phase with whatever brand you are using. keep ph in check. also once flowering, you will need to get the humidity down to 50ish at least