Why are you pushing for a low FC? If your CYA is 50 (and if you're still dissolving CYA it's going to go up) your suggested FC range is 3-6. That's for CYA of 30-50--and you want to go to the low end of that while on the high end of the range.

And if your CYA goes up some more, you'll be in the 60-90 range where suggested CYA i5-10.

So again, I have to wonder if you're looking to keep your FC too low.

BTW, I am in no way contradicting FBU's assessment.