That fancy adjustable rotor is mostly likely contributing to your timing issue.
Think of how a 4 cycle engine functions.
For it to bang that hard out the exhaust it would have to be firing after or near TDC.
16-16 = 0* TDC
If you to go in the other direction and backfired out the intake it would need to be BTDC.
16+16 = 32 * BTDC
