Test your freshly made salt water before the WC. You must rule out that this is the cause of the alk rise.I will run a test on monday after WC (hate this part most tbh lol)
but do u think spike of alk within the space of 11 days too much for the coral to handle?
That depends how fast it went, and you don't know that exactly. Like i said earlier, if it happened within 24/48 hours it's not good.
And do u think its best to move the coral to a more shaddier area? Im afraid he wont get enough light to photosynthesis and end up losing his colour. Im really on the fence about this. Is there any remedy/vitamin/food to help the healing process?
I wouldn't do anything else other then keep you parameters in check and steady. Now you're at 11 kh, keep it there for a while, go only lower very slowly, which means that your freshly made water must be close to kh 11 too.
But again, i suspect something is dosed to the water, your tank won't go magically from 7 to 11.5 by itself.
Test your new made water asap and make sure parameters are close to your tank water. Avoid rapid changes now.
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