I’ve already made a test up to 14000 ft, though with reducing mixture nearly to 50%, as mentioned through the link below
“doing the mentioned way, make me to be able to climb to around 14000 ft in MSFS, with take-off from 4CA1 and landing on KLAX
I think 50% is nearly the limit though on ground the engine is able to accept very low fuel flow in MSFS”
I will re-check 9000 ft with maintaining the mixture on Full RICH and conditions, as requested