I tested a few length Doinkers Vs. their Stealth counterparts, and while the Doinker was a good stabilizer (used one for an entire season) there was little comparison to the Stealths with respect to noise and vibration reduction.
One thing of note about the Doinkers that I did find........that active motion style that Doinker uses performed better on the more radical single cam bows I've owned, I'm pretty sure due mostly to the upward thrust/ recoil pattern they exhibit. That up and down motion of the Doinker counteracted that movement better than it did on Dual or Hybrid styles.
All that said the Stealth was still better on EVERY bow I tested.
THAT said the Doinker is a good stabilizer and decent fit to a Q2 style bow.
If you choose a Stealth, probably a 6" Hunter would be a good fit, but ask Jerry as I'm sure he knows which model Q2 shooters have been using.

I have not tested any of the MultiRod Doinker styles yet but plan to just for comparisons sake to my preferred Stealth models.......whenever I get my hands on one.