Please please help.

So these were the only cuts I was able to save that were growing on the side of a t5 because all my other clones were directly under the light. Took cuts way to early from last harvest, vegged for way too long, topped way too many times. Now they are around like 2-3 months old. Also just transplanted them about a week ago into 5gals to give them some more room after I tossed the other clones that would be hitting the lights by now(should’ve monster cropped...) Just wondering if I should flush the coco and start with 1/4 or 1/2 strength feed. I’m using H&G. Rn I’m feeding
.5ml power si
5ml calmg
5ml a/b
1ml nitrogen boost
.4ml drip clean
Ph 6.0.
I’m using 3 315cmh and a led light my buddy let me use for this round. Temps range from 69-80 and rh from 50-65.