Looks like you've got a good handle on things. I am not the SWG expert, but I do have a couple of suggestions: I think you need to target around 90 for your TA, based on other advice given by other folks around here who ARE SWG experts , and you might want to go slightly lower on ph, maybe 7.4-7.6. I say this because with a SWG you're always going to be fighting a natural pH rise, and even at its highest you don't want to be over 7.8-8.0. Starting from the lower point might give you some wiggle room.

Also, I understand that most SWG cells work more efficiently at CYA around 60-80, but the owner's manual for your SWG should tell you where it needs to be. If it says 80, then don't be afraid to go to 80, because that's where the cell will work the best.

Janet