well I have over fertilized before and what your saying your seeing is what happen to me.

Wow...water every day....!!!!!Thats a lot, try backing off the fertilizer and water ,thats whats causing the curl.
Thats what I use use as a guide, too much curl, back off the fert,......Bananas will tap root down deep for water.

OK, I'll back off a bit on the water. I was going to stop the fert in a week or so anyway. This was my first year growing them. I started with 3 basjoos from home depot that were maybe a foot tall in early June and the top of the tallest leaf now is probably seven feet. This leaf curl is the first complaint I've seen that I might have overdone the water or the food. The only other casualty was the poor euonymus which lived nearby. There was definitely way too much water for that guy.