2 engines in a year... wow :/
Makes me question whether the stock "flat"-6 design is an handicap on the circuit you normally go too (mass moment of inertia). Do you have many corners exits that requires very long & hard acceleration? Just wondering because others seems to have pretty reliable results when tracking their M96 eng on other (smaller?) circuits.
If that'd be the case anyway (I doubt mind you), beefing up the assembly would be remedial to this F6 design issue
Have you found the answer to breaking-in the engine? I'd expect quite a few very fine particles in the oil for the first few flushes. Unavoidable, although the filter would catch most of it if not all.