Brick,
I'm noticing that your profile says that you have 136 jumps over 3 years. That may be innacurate (notice I don't put anything in my profile). If it is accurate, I would suggest spending a season doing many skydives for becoming very current. During that season lose the weight that your planning on (or more) and you will find gear that is much more comfortable as well as making the hike out of the bottom of the canyon much less exhausting, or ladder climbs or hikes to the top of cliffs etc. Spend a season really "training" for BASE, that way when it is time you can go at it really hard without being in danger due to unwanted fatigue. I lost over 80 pounds in one year, it can be done.
Good Luck,
Paul Sig lines are so stupid.