Would you be able to chop one inch off the longer limb, then make that the top? That would make the difference only an inch, and maybe more workable? I don't suppose whacking the whole two inches off would work that well, so maybe one could be a compromise? You may need to make the bottom limb a little thinner in profile to accommodate the shorter length ... not sure about that though. You'll have to see what the tiller looks like when you get the limb profile cut and nocks on. Ooh, nother thought -- after whacking the inch off the top, maybe move the string nock down an extra half-inch from where you mark the bottom (eg, if the bottom is an inch from the tip, make the top one 1.5 inches from the tip). That would bring the working portion of the limb closer to even.