Yeah, just hold the FC at 30 ppm, and brush away at any spots.

Adding borax sufficient to take your borates to 60 ppm will help some too, and will create a certain amount of permanent algae 'resistance' in your pool. You'll need 15 boxes of borax and probably 5 gallons of muriatic acid to compensate, and have a bit left over to lower your pH to 7.0. If you START with the acid and cycle the pH to below 6.8 and then add borax till it's back to 7.2, you'll also tend to remove the excess TA which 'feeds' algae somewhat, too.

By the way, IF you use the DPD-FAS kit, you can run perfectly OK at high CYA. There are some adjustments, and you want to stop using anything but bleach so you don't add MORE CYA.

You can still drain if you like, but you have another option.