Bob

Rob , your constant hight temps could have something to do with it. Also I'm not sure 5-8 gallons of water your applying is all getting to the plant. The few times I've watered this year I leave the hose at base of plant and walk away for a few minutes. I also use a ring of landscape edging or other plastic in a large ring around the base of plants. From reading here I've come to find that high nitrogen fertilizers can potentially over time acidify your soil and create a situation where the plant isn't taking up other necesary nutrients. This has proved true in my garden where I've had better growth this year using less 5-2-6 than a lot of 5-1-1 or 12-0-0 which I used to use.
Since the pup is growing so well you may not have a problem at all so don't panic just yet. Pics would help. Keep us posted.

Forgot to add, what's your soil like? If you have a local cooperative extension service these guys can be great. Even if you're a schmoe from New Jersey trying to grow bananas if they have time, in my case(it's a mile up the road) the guy was kind of fascinated knew my neighborhood and soil type, and was very helpful. Never overlook free or at least inexpensive proffesional help.