Solutions for too much compression

Spark plug pics coming tomorrow. Damb I wish I could find my cylinder hear displacement measurements.
Whatever it is, and I'm fair
So I am at a point right now where I am using only machanical advance. Initial at 14 and total at 24. It’s all in by 2500 or so. If I advance it more I get some pinging. Does it make sense to put in stiffer springs and delay the advance till a higher rpm? Then I may be able to run more initial.
It’s running pretty good now, and I will probably try to add in some vacuum advance and see what happens.
If it will run 24 locked out, set it that way.

Your plugs show additives, the reddish. Shell gas can leave that color as well but usually its octane boost.

If you look at the tang your timing is definitely as much as you can get. It's about middle but past the bend and toward the ring.

I dont see it being rich, but you can cut the threads off and see down where the porcelain meet the metal case, it should be brown/tan , not black.

I knew it.