I saw the idea to make a variable timing gadget. That is not a viable option here but, I have done it in the past. I have this engine out of the airplane so I can play a bit on the test stand. The timing disk came off more easily than I expected, I used a heat gun to expand it. If I were to fuss with the timeing which way should I go from the standard 30-deg BTDC to smooth out the idle?