leaves folding into a V

some of my leaves are starting to fold up, like into a V shape.

other leaves are curling the other way, like this one




ive been feeding it 15/30/15 at half strength, i started using regular water after this started becoming more noticable.

Looks like they're getting too much nitrogen, further evidenced by those dark green leaves. You're doing the right thing by switching to water only, and it would be a good idea to do that for 5-7 days, before you give it any more fert. Flushing would be helpful too, cleaning out the soil of any excessive buildups.

Leaf cupping, (the V) can be a sign of over fert. In this case it is usually accompanied by yellow burnt tips. If there are no burnt tips, it can be heat/moisture stress.

theres a few burnt tips in the lower leaves mostly, today i just got somethin thats 0-10-10, when should i start feeding again?