The compression feels fine, when cold its hard to turn over and when the engine is warmed up i can still feel the compression. I never clean my air filters as i put a new one on every day i drive the car. I don't use after run in my engine's after driving as i was told that wasn't necessary with the ROGA fuel i use. The only time i do use after run is when rebuilding the engine. I don't really temp tune, i look how the engine performs and if there is a nice trail of smoke coming out of the engine. I did temp the engine when the problems started to see if it was running to hot but it was running at around 100C to 120C which seems fine to me.