I weigh more than any other climber I know, and I've had no difficulty jugging a pitch.
Keep it simple.
If you will be jugging a few overhanging pitches, figure out the frog. Rock and Ice has a really good article in their tech pages on this system.
If you are only jugging, you could make some non-adjustable foot stirrups like MattP suggests. Use a rubber band to keep them on your feet. Girth hitches and other slipknots will hurt your feet after a short while.
I've cleaned with a Gri Gri on my harness. It was wierd for me, but I'm used to the two jumar system. I've heard that it's great for cleaning traverses, but I've never tried it there.
Underworld - Aren't you a fan of the one Gri Gri, one jumar method?