The gains from removing the baffle depend on the RPM you are running. The higher the RPM, the more gain you get. In my TT .46 Pro, which is essentially a copy of the OS .46 FX, I was running 14,100 on the ground and got to 14,300 by removing the baffle in my Kaos. That's with a 10x6 prop running 10% fuel. Watching the plane fly, I think the gains are actually higher in the air because the engine unloads a lot. So I think it's reasonable to expect 300 RPM in actual flight. With your planes, I would expect more improvement than that. So as combatpigg said, it's not a stupendous gain, but it is a gain and it's free. With more heavily propped engines on draggier planes, it doesn't help at all. I tested the same engine on the ground with an 11x6 prop and actually lost RPM.