CYA = 9???
FC=6
pH=7.2
TA=130

Because yourTA is at the top end of the "recommended" range...

I'd try raising pH by aeration to 7.6-7.8. That should help. You COULD use Borax to raise pH but the TA will increase with it. May not be a problem, but may be.

You can also try adding salt to the water, not enough to taste, but enough to make the water a little softer feeling. After all, tears are salty.