Hi All !!! :thumbsup:
BobWeed from the photos it looks like heat stress!!
How close to light are they?
A photo of whole plant would help.

What is ph of nutes? you say ph of tap water is fine what is it?

I wouldnt add Bid Bud till week 5 of flower.

If you flush them you should feed with 1/4 strength Full Purpose Nutes.

Hope this is of some help!!
Good Luck and post some pix of whole plants.