The amount of fertilization sounds about perfect to me & I've been growing bananas for 3 years now. In fact, during the cold months, you'll want to cut that amount back quite a bit.
Bananas will go dormant at about that temp. I always bring mine indoors when temps get that low. Also, even if you keep them at around 72 degrees or higher, it's rare that they will put out more than 1-2 leaves during an entire winter.
If you're plant has 3 leaves or more, you can take pictures of it and start an Identification thread to find out what it is. The Banana experts here are very good at ID'ing bananas like that. For ID'ing, fruit isn't usually necessary.
BTW, I always leave the dead leaves on my banana plants. The plant suck potassium & other nutrients from the dead matter. Those who like trimmed plants, usually drop or mix the dead leaves into the soil for extra nutrients.
Also, if you have any more questions about photos, there is a guide to using photos in "Site Feedback & Help" near the bottom of the homepage.
Hope this helps
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