Using two stock light springs in distributor advance, good idea?

I used to light springs but originally had a 13 degree (26 degree at crank) advance cam, I shortened the slots by running a bead of mig wire on the shaft side of the slots and filed down evenly for a total of 10 degrees at distributor. It works out to 20 degrees mechanical at crank and 14 degrees of static timing. One of my light springs is lighter than the other but I am all the way in at full advance of 34 degrees all in at 2600 rpm. Your combination with proper gearing would probably run better with more static and a little less mechanical, but at what rpm is dependent on how much compression/cam/gear/stall speed. The goal is as much advance as early the engine will take without running into detonation. I am close to the ragged edge with 10:1 and 2.76 gears with 340 regrind camshaft.