I would also go with 1/2 strength or 5ml per gal.
Or with a dropper, 10-15 drops per gal., from first week of flower till about week 6.
I am not stating that it actually works. but if you think of it as a suppliment, you'll do fine.
As far as bud blood is concerned, I've heard that it has an airy/fluffy effect to flowers.
and thats not something that most would want.