Leaking bearing? That sucks. And it explains the weird engine sound and why it started sounding like this all of a sudden. Have you seen nitro fuel residues or oil around the flywheel after running?
Sounds way too rich on, both needles I'd say. Especially LSN.
But that can't be causing high temperatures. I read about someone having this on a other forum with rich engine but very hot, and the cause seemed to be the brakes somehow frictioning when driving