In my humbled opinion, I would leave the TA right where it is..90 gives you a lil room to play with.
Check your chlorine, and dose it accordingly..
I'm a strong believer the less stuff you but in your pool, the better, I think in some cases Floc is a option, I just don't think it addresses the real problem....
A lot of Times a got dose of POP is all it takes......Oh yeah , that's Pool Owner Patience..
And just In case I have not mention it, weekly brushing is a must...
Happy Swimming