If one thinks of a production brewery, the beer is not lifted and shaken. Get an O2 setup. Rocking a carboy can cause a lot of splashing. For many ales I just pump into the fermenter with the valve open which causes a lot of splashing and air entrainment.
Pumps save lifting, get a pump. Or get a friend to brew with, they can do the lifting. Smaller batches, brew more often if those other suggestions aren't appealing.
Do you wear a back support when brewing? If my back is aching I will put on my weight lifting belt, and it helps me get through the day.