Why does my car feel sluggish?

What RPM for full timing?

Trans acting any better (holding gear longer) with the new linkage?

You sure the secondaries are opening all the way?

You could set initial at 10* and that would keep your total lower, but its better to be able to run more initial. If its not detonating, I'm betting timing coming in late would be more of a problem vs. running too much total.

Anyone got a Mopar Performance dizzy you can borrow?

Another thought. It might be worth bumping the motor over to approx TDC on number 1 and verifying that your balancer 0 is somewhere near the timing mark. These balancers have been known to spin on the hub causing all kinds of issues.