Stumped by F115 surging and bogging down

[Deezboats]

2013 Yamaha F115 four stroke with 85 hrs acting up. Starts fine, never stalls. Runs fine, full RPM range with gear disengaged. When in gear it bogs down and won't get over 2000 rpm. Sometimes it gets up to full RPM but randomly surges and drops 500 RPM then shoots right back up. Runs better cold and gets worse the longer you drive it. Only non-ethanol fuel. New fuel filters, VST filters, compression test good, injectors good, connected to YDIS and no codes. Had bad lower unit gear oil only 4 months after replacing all seals. Leak checked and seals are good so not sure why oil was bad. Not sure if that could be related to engine issues. Any thoughts would be appreciated.

[panasonic]

Have you checked the fuel rail pressure? Does your alarm work and/or getting any alarms?