For the lat 12 yrs. i owned a Ultimate 10-200 lookalike, with a O-540L3C5 out of a Cessna 182TRG, hopped up to Injection and 10-1 Compression (290hp).
During the 100hr inspection/Annual included in the sale, i had Chips in the Filterscreen. Not to many, i would have operated it further, but the buyer insisted on Repair.
"The front Mainbearing was making metal and subsequently all bearings were gone." Oilpressure was still ok around 90psi.
During one of the Last flights in Winter, i had the same Issue: My Prop in a Vertical Up behaved like a Fixed Pitch and i couldnt Change Rpm afterwards. On the Ground it worked quite normal...