Hey Byron,
If you decide to keep the original volume you can change the port-area to get a better compromise. Go for a total of 400cm2, ie 100cm2/port, when placed rearwall/floor(1*Pi). If going for corner placement(,5*Pi), 300cm2 is a good start.
For those wanting to cut a 4560, you should cut all above the horn(all reflex-openings at the bottom) and also block the cavities at the hornsides. Volume will then be below 150dm3. Looks OK in 1,0*Pi: