I tried removing my exhaust valves, and I found that removing the forward valve (furthest from gun) made no difference,
but removing the reverse valve (closest to gun) made the gun cycle much slower.
In fact, without the reverse valve, it could barely cycle at all. The reverse stroke compresses the main-spring and needs all the help it can get.
I'm not sure how removing one can make it cycle faster? All they do is remove friction, unless your exhaust valves were defective or broken?
Who knows. IF your RM is running great then it doesnt really matter...