Ugh, back problems. I've had them from well, spending 12 hours a day on a drum stool, and curled into a "C" position in the backs of vans for months and months on end. Not to mention humping gear every day.
Sounds like you have worse problems than I may have, but it's not fun. One of the reasons I started strength training, was because of my back mainly. I see a trainer who's methods and philosophies are different than some of the others I saw, he was a big core guy, kneeling on swiss balls doing free weights, strengthening back muscles and core, it has done wonders to help support my back. But of course you have to be able to do those exercises. It literally saved me and kept me playing. I'm a pretty insanely hard hitter, I give a pretty rousing set, and at one point, I was gasping for air and my back was toast after about the 4th song, it wasn't pretty. I've for years had a posture that I was sort of known for, I'd set my drums up real low, even with a 26, I sit up higher, and I would crouch over and swing at them like a madmen, it looked great (and it worked well for power i guess) but it nearly ruined my back. Here's a shot of the wfl 26 with the 13/16 ludwigs set up for a video shoot, it shows my set up.
Yes there's a towel in the hats, (to shut them up) and no ride for the video, but the rack is down low and flat, it's also miles away from the floor, guys would use my kit if they opened and would complain because the rack was literally down up and to the right of the hats about 3 feet away from the floor. I loved it and I'd have more swinging room. But it really stressed my back, so, I've had to ease on that setup a little, and lower my stool and sit straighter, after many years it took me a long time to get used to it. Here's a (sorry really fuzzy) pic of them set up for a show (that's not me it's a sound guy setting up)
The rack is now higher, the snare slightly tilted back and my stool is lower. I find it still odd, but I'm getting used to it.
Incidentally, I have another fuzzy pic (worst photographer ever) my new sonors, when I first got them home I set them up in my living room and gleefully played phil collins rolls for 10 minutes on these new ones. The 13 rack is not there it's on order (it'll take a few more months apparently. Best sounding drums I've ever heard bar none.
I tend to use a 4 piece for most gigs, I thought of ordering a 18 or q 20 to match the 8/10/14 as a smaller kit. I have the other toms mainly for recording needs.
btw love vistalites. Never owned one (though came close a few times) but I've played quite a few. Not long ago I did a show tributing the monks (former strawbs members) and on of the monks played with us to an amazing club show, I found a couple youtubes. In it that's me happily playing a set of early 70s blue vistalites that I used for the night. WOuld have loved to take them home with me.
No Shame- Ian Blurton Monks Tribute - YouTube
"Dear Jerry" & "Ain't Gettin Any" John Ford & Thom D'Arcy Monks BAD HABITS Tribute Toronto - YouTube
http://www.youtube.com/watch?v=7XENnzKAMxc
Second link, second tune is where he came up for the rest of the set. I had a blast, even with the clicktrack for some of the songs and charts