Noob needs flowering help

I was hoping not to ask for help this soon as a new member, but my girl has developed a problem. Here are a few basics:

I am @ 14 days into flowering.
Growing in Phototron.....I know please dont start with that
Grow medium is Sphagnum moss
Nutes were provided with unit. So I am unsure of composition, but all has been very healthy for @ 70 days.
I am running @ 39k lumens mixed spectrum
temps 65 -85 f.

A couple of days ago the leaves on buds at the top of the plant started folding under and drooping. I also have significant purpling of stems. From reading problem forum it seems like it might be a lack of Phosphorus. Now I cant find sticky where i read that. Buds lower on plant dont have the same problem. So I am thinking temp might be to high as well.

I have started flushing with distilled water, but no love yet.

Any help much appreciated.

forgot to add pic, then realized it is too large to upload. will get another tonight or in a.m.

maybe u need more air my plants do that if its not venting good

As for nutes flush and start over. Use a nute with a little more p and k

also sometimes its calcium and mg