stop watering all together till the plant drys, then just phed water no nutes yet then feed, water feed etc
leaves curl like that from over nuting.
The bottom leaves you pulled off that is a sign of a potash deficiency. However judging from new growth you no longer have that.
I don't use a fixed schedule for watering or feeding. After a while I've gotten used to the weight of a pot when I pick it up; it'll be light (but not too light, like styrofoam). I've never had luck with straight soils like Miracle-Gro or Peter's without adding perlite or Canadian peat moss (too dense; not enough drainage). What I've been doing lately is looking at the leaves right when it starts to grow (3 weeks more or less) and trying to memorize that exact color. I'll water moderately each time the pot feels light unless that color or appearance starts to change, then I'll feed.