Re: soil type
Overfertilizing did casue some varieties, with a particular "style" of leaf emergence, to grow too fast, which resulted in tangled leaves. When fertilizer levels returned to normal, so di the growth habit.
Brown areas, in my experience, are the result of inadequate moisture, from underwatring, uneven watering of the entire root mass, excess evaporation (low humidity climates, or periods of the year), or root damage. If you remove a pup, you damage some of the roots of the parent plant, and those roots seem to be associated with certain parts of a particular leaf or leaves. So, if it is associated with an emerging leaf, it will have the brown areas. That damage results in brown (dead) areas. The other option is that overall moisture stress on the plant is expressed in a random fashion by the plant, resulting in a random arangement of brown patches on all leaves, including thosed that are emerging. Either way, the result and cure are the same. These stresses are not immediately manifested, but seem to be revealed over a period of time, seemingly more in the range of 5-10 days. So when you see such issues, they are more likely the result of conditions a week ago, not current conditions. This lage time emphasizes the need to be proactive in banana plant management, rather than reactive.
I have definitely not seen any burning due to fertilization.
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