How is it doing today? Has the white patch progressed further? I dont think this is parameter caused, especially now we know more. You have other healthy sps and we know you are dosing to keep parameters steady. Some corals just dont do as well being transplanted.
I have quite a few zoas (mixed reef sps, euphyla, zoas) that are mostly happy, but I have 2 that are continually stretching they are in a fairly high par 175ish with good flow the rest of the zoas in this area are happy and look as they should. I have been wracking my brain trying to figure out why these two are acting this way. I had forgotten where they came from but finally talking to the vendor I figured out why, they keep these two colonies at 400+ par along with a few others, no wonder they are acting weird in my tank. I dont have anywhere in my tank with 400+ par I could but do I need it? Sps doing great in about 250 and hammers and torches in same happy also. Basically I am saying some corals will do fine with being moved from one set of parameters to another while others will struggle, and they may overcome or not. Of course, this is barring some other things like a parasite or drastic parameter fluctuations.