I use FP all the way through. The way I run a perpetual I was having trouble getting the Bloom and FP dialed in.
I found some good info over the years of use with FP
All done in either Pure Coco or CoCo/Growstone mix
All with RO water
1ml FP per Gallon = 100 ppm on .5 scale
1 ml Protekt + 4ml FP per gallon = 400 ppm and ph at 6.2 with NO adjustment. Nice huh? I like not having to adjust PH.
My veg formula is:
Per 4 Gallons of RO
4 ml Protekt
16 ml FP
5 ml or less of Humic/Folvic acids
400 ppm and ph of 5.9-6.2 depending on how much seaweed extract/humic/folvic etc I add in (small amounts)
Mothers, Clones and all my Coco Veggies love it. It's my base for anything green and growing.
For flower its just increased a little.
Per 4 Gallons of RO
6 ml Protekt
24 ml FP
Various Humic/Folvic/Kelps (I play around a lot with these, experimenting with taste and aroma characteristics)
600 ppm ph 6.0-6.2
Best of Luck and Congrats on a very fine Nutrient Line!