[tjones62]

bummer this post didn't get answered but on the off chance you are still pondering the issue....

looking at the picture your bigger port hole (looks to be 6-8 inches) is almost dead center. i personally think that has to be directly related to your issue. your reso head likely doesn't react as it should because alot of the main punch and air presure created is going to go right through the head and never hit the reso head.

as for live it likely would be very loud and punchy, low frequency's like bass take a quite a bit of space to fully develop (or so i have been told).

any way i have 2 6 inch ports on my head one at about 4:30 and the other around 7:30 an inch or two from the edge and i have no issues getting the sound i want out of my bass drum.