I had a 125gr head with a 15 gr insert. Although a CT insert for the whitetail will weigh 22 gr. I suppose I should have left the insert at 22 but was think a standard insert. So, anyway, with the CT insert that would bring the spine even closer to .300 and you could probably get away with a 30" shaft.

With the speed of the Commander you really don't need to increase the tip weight all that much past 125 but if you wanted to fool around with a higher FOC and shorter shaft...........