Tamid -
Unless you are malformed there are only a few components to stock fit.
LOP
DAC
DAH
Cast
Pitch
(I am of course ignoring a couple that only the totally committed concern themselves with and have no effect on Tamid's quandary.)
For me personally, none of those are interrelated. With an adjusto stock of some sort, PFS is probably the least expensive and pre-owned ones show on ebay and trap sites, each can be set independent of the others. AFA I'm concerned I can set everything in about 5min except for perfect comb height (the only value that actually needs to be fairly precise) and I can get that within +/-1/8" easily - - later set on the plate. That's what try-stocks were devised to do. Just carving away on a hunk of wood will likely not ever make you happy.
FWIW I've never heard of anyone suffering with any of the 680 series trap configurations.
besta luck
Last edited by Wonko the Sane; 06/19/18 10:29 PM.