That it typical of what we call Flutter. Its caused by turbulance coming off the crank. A common solution is to install reed spacers. Some manifolds like the Boysene and others, have the reeds spaced back from within the manifold, so a spacer is not needed. What manifold are they bolted to?? You also stated that your cases were epoxy filled?Im guessing you mean the fingers are filled?? What this does, is reduce volume, but increase air speed thru the reeds.
Typically done in high rpm motors. Unfill maintains volume, aids in low end performance. Reguardless what option you prefer, the reed pedals take the brunt of the added flutter. Carbon reeds wear faster in high flutter, than say Boysene pro reeds which are all glass. Bottom line, there is no right or wrong to this. It Is how you or your builder chooses to have the power delvered. Its how the recipe of parts compliment each other!
Ski Ya, Paul
