Armen, that quest for a featherweight is a never ending battle. I admire your tenacity. If you folks haven't seen any pics of Armen's masterpiece, I suggest you lobby hard for a look see. It belongs in the Guggenheim.
Regarding ignition advance curve:
The factory service manual lists advance on the original Savage as 5 degrees BTDC before 2000 rpm, and 30 degrees BTDC after 4000 rpm.
Then, in 1988 that spec was changed to 5 degrees +/- 2 degrees BTDC below 2000 rpm, and 30 degrees +/- 2 degrees BTDC above 4000 rpm. This spec remained unchanged until 2003.
Then from 2004 to present, the spec is listed as 5 degrees BTDC at 1100 rpm.
Data I took and posted back in April of 2018 showed that my 2016 LS650 (stock at that time) was running 3 degrees at idle and 27 degrees fully advanced. This old post gives the lowdown on that test.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1521968829So Armen, your 28 degree threshold might be right on. But alas, I must try. I used to run 25 degrees on my hotrod Harley, but that was with a power adder. Virtually everything I have read and am currently reading suggests that you pull out timing when you jack up compression. That's not intended for protection. Its for the exact reason you gave, the charge is more turbulent and homogeneous so it burns a lot faster. Hence, you need to light it off a bit later. We are in total agreement.