If you change motors as well as the batts. How do you know what makes more power? If the 9L don't work out put the 7xl on. I think it do better on heat issues.
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If you're not going to use lipos, 14 cells, 9920, 7XL will be perfect. I do use a UBEC, and geared so the motor only hits 155f I can run for about 6-7 minutes before I thermal. Given the abuse my ESC has seen I do not think this is bad. The problem seems to be the constant high current and long runtimes make things heat up too much...