If the battery truly is fully charged and the starter is functioning properly, then the only other thing is the wiring between the battery and starter.
If you have a high resistance connection in the starter circuit, it could produce the symptoms you describe. It will get hot when you try to start it and the more you try to start it, the hotter it will get. As it gets hotter, it's resistance will increase.
After you try to start it, check for warm cables and/or connections. All your connections need to be clean, bright and tight for best electrical performance. Don't forget the ground side too.
Assuming that your battery cables are properly sized.
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