Runoff pH way too low for soilless. Flush at pH7, bring runoff to 6.5, then feed with HALF strength nutes at pH 6.6 or so.
Sunshine is peat-based; if you have not repotted in the last 4-6 weeks that is a likely culprit.
Also you are very badly burned. The flush will fix that. Isntructions at top of problems section.
I have seen a lot of problems with people running AN recently. It's one of those systems that is easy to run too 'hot'; your high temps are contributing to the severity of the fertilizer burn you are seeing.

Flush out the unused fert salts, and raise the pH. Also you NEED to get more ventilation in there- you have to run fans in daytime too!!! And RH% @75 = botyris in no time. Get it down to less than 55%rh