By this point, I'm pretty sure that just about every possible method for carrying luggage on a bike has been explored. No matter how you slice it, traveling with lots of stuff is going to be a hassle.

You should try using a trailer, it's much more affordable and versatile than a Big Dummy. Keep in mind that in terms of weight, a trailer is fairly close to the weight of panniers.

Another option is to carry less stuff. You may not want to hear it, but the reality is that everything has its trade-offs. The more creature comforts you carry, the more of a hassle it will be to lug it around.