Ethan,
You have my vote. I plan to do a Jumbo soon also. It will be nice to see a Sherman or two fill the allied heavy ranks. Maybe it will cut down on the high M-26 count, which I have never liked that much. On a side note - if evryone starts building Jumbos thats not the answer either.
I also agree with pcomm1, tactics and skill contribute to victory much more than IR settings in IR battles.
PS I find Its a lot more fun kicking heavy but with meduims