Burnt ACRO tips

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Hey guys I was hoping to get an opinion on how to deal with the burnt tips on some of my acropora colonies. So I recently burnt the tips of two of my colonies and a couple frags due to high alkalinity. Long story short unreliable tests lead to my alk going to 10.5dkh about a month ago I slowly dropped it back to 8 but the damage was already done. Its been about a month and these colonies have yet to recover and the STN is still slowly progressing. What action would people recommend? These are picture of my Miagi tort and cali cops colonies, There is a third colony for reference that is still doing great. I had good growth on all of my acros until this point.
current parameters
ALK 7.5-8
calcium 450
mag 1250
salinity 1.25
nitrate 20-30
Phosphate .1-.15
https://photos.google.com/photo/AF1QipOkzjoPvxFwXKfGMfUyYQCkV2Nt2KBZ05Oi-tyR

Just for reference some of my acros are great

 

[Lavey29]

I wonder what would happen if you cut off the burnt tips? I've had fish break stem branches and they grow back fine.

 

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Yeah not there is still flesh on the bottom of the tips it's just the top that is burnt in the tort. I did lower the intensity of my lights

 

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Anybody have tips for me??

 

[386reeftrader]

Cutting them all back into healthy tissue will be your fastest route to recovery. The axial corallites won’t recover, or come back otherwise