Use more "Hubba Bubba",,,,,Lol,,,Seriously though,,,it sounds like you have the timing a bit off,,,,hopefully the starter is not on it's way out,,,have you done a complete Draw test yet??
As for the leak,,,,run a socket on those bolts and give them a tweak,,,only a slight tweak mind you,,,,over tightening will cause more problems.
It could be the difference between,,cold motor,,,pan gasket,,,,and hot motor pan gasket,,,,,you may be leaking a tiny bit when it's cold,,,then stops when hot,,,tweaking usualy helps.