Tweaking Inlow horn dimensions

I have the ingredients to put together a pair of inlow's design midbass horns using the B&C 12PE32 or 12MH32. I wondered if anyone has ever played with the outer dimensions of the horn to make it as living room friendly as possible without negatively affecting general performance?

I understand shortening the horn will cause more ripple, which I want to avoid. They will be sitting close to (but not on) the ground spaced several inches from the back wall, assuming that matters.

Having run calculations with both 12MH32s and 12PE32s, the throat area ends up smaller on the 12MH32, increasing the horn length and the compression ratio compared to the 12PE32. I suppose that means the more suitable driver for this horn is the 12PE32.

Has anyone built these using a modified outer format that hasn't compromised the performance of the original design?