8 plant coco run

First week of flower. Still trying to dial in the drip system. Right now I’m running it for 1 minute 1 hr after lights come on every day. About 1.5 gallons between all 9 plants. The back half of the girls love this routine. But the 4 in front i think are not getting a good dry back. These are the same 4 that did not stretch at all