Some Thoughts On Slant Geometry

Just to randomly throw this out there...I also wonder exactly how much of the 225s displacement is actually viable.
Meaning, with only a 3.4 inch bore, how much of the charge is spent before the piston travels to its 90 degree ATDC point, at lower rpm.
By speeding the pistons acceleration rate away from TDC, as you would with a shorter rod ratio, would you then be closer matching the duration of effective burn to the number of crankshaft degrees covered?