Just as an update, I ended up going with Accurate exhaust hemi repop mufflers, 2.5 in and 2.25 out. Drone MOSTLY gone. The range it used to really bother me in is gone but with the accurate stuff the drone does and can occur at a very low rpm. Thankfully I'm seldom in that range.
On a side note, the sound freekin awesome!!! Sooooo many compliments and I really love it now too. The best part of the sound is at idle, very throaty, when you're on it and giving it full throttle they are respectfully quiet. Not a nuisance muffler.
Happy with the purchase
Glad to hear - and you've kept the H-pipe, right?
(I've got virtually the same setup as you used to have, 383/4bbl 2in H-pipe and FlowMasters with a wicked drone, but only right at 45mph.. so I just don't stay there much. Now I know what I'll do when it's time for a change.. but I think I'll drop the H-pipe too).
Cheers,
- Art