Dave, our tensioned barrel does away with the air stripper, so the end user needs a standard 1/2-20 threaded moderator to cut down on noise.
Have you tried different pellets in your current barrel? I doubt tensioning is going to help much in a barrel that doesn't already shoot decently. You might try polishing up your bore with a cotton bore mop and some Flitz. I'm not sure the twist rate of your barrel, but you shouldn't see accuracy issues at that velocity. I've noticed that on average, around 880 seemed to be the sweet spot for the 25.4 gr pellet. As far as pushing pellets over 920, most current barrel have too fast of a twist rate and cause accuracy issues.
We've seen great accuracy from the LW barrels, both tensioned and not.