I said I'd post the results of slipping a small piece of hose over the end of the reluctor arm stop... well - it worked very well! I'm running 15 degrees initial advance and 34 total. I'm going to fine tune it a little more still, but it ran better than ever right off with those numbers. (The crank damper is new so the degree info should be valid ... even if it isn't, the measured total centrifugical advance should be correct - which is now 19, before this change it was about 29 degrees). It still seems like the best method of decreasing the total centrifugical advance would be to get a reluctor arm with a smaller setting (like the ones with the 10L stamped in 'em), but this tweak seems to have worked well. Thanks!