I also have back issues from time to time. For me they are triggered
during rigging. I need a self rigger I guess.

I assume you wear a parachute. The trick is to get some lumbar
support between the chute and you. It doesn't do much good between
the chute and the glider.

After buying a used Strong parachute model 305, I sent it to the
factory for an inspection and repack. During that work, Strong
retrofitted a lumbar support cushion into my parachute harness. Very
nice and has made flying much more comfortable. I don't know if this
is available separately nor if it will help you. The support is
mentioned on this page but I don't see any details.
http://www.strongparachutes.com/page...5_Airplane.php.

Basically, the Strong item looks very much like this =
http://www.autosportcatalog.com/seat...rt-cushion.cfm.
$30 with memory foam. You may want to try an auto parts store or
Walmart to find something like this and see if that helps. The Strong
item has a strap meant to hold it in place on the chute which you
might have to retrofit.

Good luck.

- John DeRosa