Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

In trying to Improve my M90's H & M with more time/misses between hits in an otherwise Perfect running condition,  I've considered Removing 1 of the 2 O-rings to Significantly achieve improvement...Which O-ring should I remove ? ..The Least intrusive method, I think, is to remove con rod cap, withdraw rod/piston assembly Rearward, partially out of cylinder, remove con rod & remove Lower O-ring Without Disturbing cylinder head/gasket assembly ....Is removing 1 of 2  O-rings worth it all ?..thx,.....tom.