I'm having a hard time with my speck call prototype. I'm using the spk guts from WEBfoot and they sound great, but with a LOT of air. Is this normal for these guts, or do I need to do something to help? My bores are 5/8" for the barrel and 1/2" for the exhaust all the way through (no step drill for the end). Should I open up the end of the exhaust maybe up to 5/8" and drill 1/2" deep or so? Any help would be much appreciated!!!