I'm an RB fan Denny, and I can tell you from experiance that a .45 PRB will do the job on Whitetail. The biggest problem most guy's have is wanting (or thinking ) they need MAX loads for anything bigger than a rabbit! Accuracy is really the key issue, and that many times suffers when the shooters goal is max velocities and footpounds, anyway, I'm sure you've seen this argument many times and I don't want to "kick a dead horse"," it ain't worth nuthin anyway's".
If the accuracy of the maxi works for ya, why not just try a different lube? Years back I was messing around with Lee REAL's and different lubes and found that liquid Alox worked just as well as BB. I'd just pour some on some aluminum foil then roll'm around. Once it set's you can even get a second layer on. I did use Ox-yoke wonder wads. I can't really remember if I had cleaning issues,,it must not have been too bad or I'd have rememberd that! BP cartrage shooters use the stuff all the time. Some guy's mix crisco and bee's wax. Heck, there's a recipie right on top of the page.
Long story short, I got better accuracy with roundball and have just stuck with them ever sence. good luck to ya.