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dampening barrel harmonics

Just curios has anyone tried barrel dampening with rubber sleeves rather than tensioning? I have a benjamin bulldog that I have modified for power and accuracy.
I used extra barrel supports and it made a difference but I wondered if there was something else to be gained . So I cut pieces of hose ( eaton easycouple much stronger than standard heater hose) and slid them on the barrel between the spacers . The hose fit very tight it would have to be cut off to remove. The results were actually promising . the groups tightened up and it seems less power level and ammo picky. I had purchased a second bulldog later to make a carbine out of and tried it side by side with same mods with barrel supports without the rubber hoses, and the one with hoses was better. I installed hoses on the new one and same results . I have since turned it into a carbine and really like it. I also did this on my condor and it made a difference as well. Any thoughts?
 
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As an experiment, I poured hot melt glue into the space between the liner and barrel sleeve on an FX Impact 700 .22. Best results I have had to date! It added some weight but was well worth it for benchrest. I also tried it both tensioned and without. Even with the hot melt in the tube, it benefitted from light/moderate tension. I would do it again! I did it as an attempt to test before trying to epoxy the void. It worked out so well, I never tried the epoxy. It provided a very dampened feel.
 
Here is a picture of what I did
IMG_20221029_132221351.jpg