Well here is where I'm not sure about things and am doing some guessing. I have a feeling that they are mostly sucking down CalMag.....you mentioned before that they did not appear to be eating much.....obviously now they are. You can go two ways with this....

I would say when your number gets down below 1000 you can either add 100ppm CalMag or change things over to a whole new rez solution.

If you are going to change your rez.....If it is possible to use ALL RO water here....I would if I were you. If that were the case I would use RO water and 300ppm CalMag in addition to whatever you are running...(about 1200 ppm with supplements) .if you use tap water.....if you use 1 gal tap water I'd go with 250 ppm and put your number at about 1100.

Other option would be to just add more CalMag. This is much less precise however....because we are only assuming the plant is eating the Cal MAg....we're not really sure WHAT the plant is eating....capice? It's a pretty safe guess I think.....but not positive so that route is a litte more chancy imo because you could possibly end up putting in too much. Between your bloom nutes and your CalMag....I'd like to see 1000ppms.....700 base nutes and 300 CalMag (or tap....but I'd like to dump your tap stuff completely) and then the LK and Sweet numbers after that....and I'd stay under 1200.