Trying to apply my brain to this, but it's fast leaking out the holes. If I didn't already have so many openings, I might be considering a fresh port.
Cutting a hole may encourage a "forward" oriented attack, because high frequencies (beater meets batter) are directional. Attack is muted, in front of the drum, by the presence of a resonating head- although probably not by much once one gets beyond that acoustical shadow.
Bass freqencies are not directional. Escape of air doesn't conflate with direction of sound.
A ported bass speaker is not created by a cut in the speaker membrace: the hole is cut in the solid cabinet to free the motion of the membrane. In our case, with two membranes, needed pressure relief is provided by the vent hole.
The BOOOOOM character Goki is dealing with is not yet fully defined. It is a sound that, to my knowledge, I have not encountered in a Classix. I spent a great deal of effort trying to encourage what I would call boom (warm lower mid-range). Perhaps it is the enduring low bass and sub-sonic rumble?
Kelly, I suspect the S-Class bass is not very much like the S-Classix. At least, the Classix is nothing like the experience I have with maple Designer, which I would call a very round, open, resonant sound. The Classix is heavy on attack and low bass, but with a scooped out middle. Does that sound like S-Class?