I was going to use "Grow Big Liquid Plant Food" (6-4-4) for vegitive

and then i wanted to use "Roots Organics HP2 (Liquid Bat Guano)"
0-4-0 for budding

but im wondering if i should be useing both durring budding

or doubble the amount of bat guano to get it upto 0-8-0

dose anyone have any advice?

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Selectz..... Grow Big will work just fine for veggie growth. The Liquid Bat Guano is an excellent source of P for flowering.
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During flowering, use the Grow Big at 1/2 strength the first month, at 1/4 strength the last month. I have not used the brand of liquid bat guano you are speaking of, however, read this post before going guano happy.
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http://www.rollitup.org/1233525-post6.html
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Hope this helps...
Keep it Real Organic...or as close as possible.....
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No, Ohsogreen is wrong. DO NOT use grow big during flowering because it contains more N than P. 6% to be exact. Only in ur veg stage do u use more N than P and when in flowering stage use more P than N. So typically for the first month you can use fox farm grow big etc.. but depending on the strand veg stage can range from 4 to 6 weeks. When plants enter flowering stage switch to fox farm tiger bloom (highly recommended) etc.. or anything that is high in P. Bat guano high P is liquid or dry is fine. Remember, when moved to 12/12 the plant should recieve no light once the lights go for the best results.

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Atlantabud..... I have been growing for 30 years and not one person in that time, has proven to me that NO N during flowering yielded any better, than providing some N.
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I recommended 1/2 strength on the Grow Big, that dial the numbers down to 3-2-2. Used in conjunction with the 0-4-0. That makes 3-6-2. Which, makes for a higher P, than N.
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Bumping up the 0-4-0, to double strength. Makes that combo 3-10-2 That or the 3-6-2 are both fine for flowering. If you noticed, I recommended dropping to 1/4 strength the last month on the Grow Big, that drops it to 1.5-1-1 used with the liquid guano, it will not be too much nitrogen. That corrects the NPK value to 1.5-5-1 or 1.5-9-1, if you double the 0-4-0.
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Withholding all N will cause the plant to pull N from the fan leaves quicker. The fan leaves are your sugar factories to feed the buds during flowering. No N is not a wise way to go.
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Don't buy into the Big Hydro Fert companies BS about you need their three part nutes to grow. You don't. They just break them down, to make more money off growers.
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In nature, NPK is present in the soil during the whole grow. Mary has survived thousands of years without our help. Mary takes in what she needs, as she needs it. If you deprive her of N, you are just causing a premature finish, which equals less yield.
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Hope this helps....
Keep it Real....Organic.....
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P.S. - As a matter of etiquette, I use the words " I disagree with" instead of saying Atlantabud "is wrong".
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Damn Atlantabud, come on ... I want to read your reply to what Ohsogreen wrote.

tiger bloom contains nitrogen ..more than enough to do the job in flowering stage..i agree with atlantabud..bat guana and tiger bloom is all you need..feed every other watering....peace bro's...

by the way i grow with fox farm tri pak and use flora nutes hydroponically and never even use thier grow formula in my drip system....

if your plants go n def to early in flower your in trouble, you need to have a least a little n to keep vigor. thats why a little guano(N) in the start of flower can be helpful.

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the truth can be tuffa den the timez, my reminda my people to shoulder!!(WA/OR state Medical User)

But then now he has to buy tiger bloom when he doesn't really need it.

I know it old but...