are totaly in love with that style peep ?
you could go with the "shurz-a-peep" and avoid the tube all together.
That is actually what I shoot but I realize it isn't for everyone as some folks have trouble seeing through the split string as certain angles. I do think that tube length can play a part in the amount of noise it creates. Try using different lengths to see if it helps any. I would prefer a shortertubing but may be wrong in my assumption.