Sometimes lipo's will temporarily swell if you draw too much from them or if you exceed the discharge rate. It sounds like the higher temps you are facing has caused your cells to just about exceed their comfort zones.
Now that the lipo's have tightened up again they should be safe to use but make absolute sure you do not do it to them again. if you reach a point where they do not tighten up or that they are swelling up after every run - Then you want to dispose of them safely.
What i would try and do is set the low voltage cut-off on the esc slightly higher and limit the current the esc can draw from the batteries by reducing the punch / acceleration settings.
Hope that helps,
Demon
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