PPM's of Gen Hydro's Flora 3?

Hello,

Does anyone know what a good (strong but safe) PPM amount of the GH flora 3 part would be? The online nute calc at their website lists the three plus the licious and blend combined @ 1080 for general purpose regular strength grow.

When I mix up just the three in a 3-2-1 mix as the bottle says, I get 1500+ PPM. (with RO water @ 20ppm - no calmag).

How can I get more PPM of nute (1500+) from the 3 part, when the 5 part on the website is 1080?

Also, when i mix up a 15 gallon batch of nutes in 20 gallons of water, I'm still at 400ppm's higher than they recommend (still 20ppms starting - no calmag).

What I'm getting at is, Does anyone have a good General Hydro 3 part mix recipe w/calmag. I know I need calmag with the RO water now, and will add this today with a new 20 gallon mix.

ps

ebb and gro
20 gallon res
18 buckets added on
general hydro 3 part flora
Ro filter w/20ppm starting water
adding calmag from now on at bottle specs
Hanna EC/PPM, Ph Grocheck hand held model (mucho $$)
Ph always kept at 5.9
1000wat Quantum Dual spectrum dual voltage DIGITAL w/Dimmer Switch
Room Temp kept at 70 - 85 with use of A/C and Air cooled light
Light mover 3.5