OK, thanks. May be a little while 'till I make it over to the indoor range, but they do have a paper frame setup for tuning. Meanwhile, before reversing limbs as suggested, I tried sanding off the sharp corners on the bottom of each. Lo and behold, when I reassembled the bow and restored my brace height, tiller measured 0 and the bow was quieter than ever! Definitely a much better solution than playing around with loose bolts.
It might also be worth mentioning that the bow was definitely noisier and not as smooth when I shot off of the shelf. Do I have this right, that raising the nock point as well as reducing tiller both served to weaken the lower limb in realtion to the upper?
Now all that's left is a little paper tuning and I will have the bow set up as well as I can.