MSD distributor tuning

TT5.9mag said

With 15 initial, why do you need 30 more in mechanical? That’s 45 degrees all in. Way too much. The reason you can’t get more mechanical is the MSD is limited to the bushing size available and the smallest bushing, red (most mechanical advance) is 28 degrees.
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No I have 15 initial and another 15 Mechanical. 30* total. Will not go higher until vacuum is applied then goes to 50*. I replaced the blue bushing with the silver and I got more total timing now, from 44* with vacuum advance. This is why I think the heavy spring may be holding me back.