tech t bolts are utter $h*+, they dont make it any quieter, i had an etek 4 with hush bolt, fired it next to my mates standard etek 4 and it was no quieter, changes the sound signature slightly, ever so slightly, but no quieter. all i noticed was that it scuffed my breech to bits, and more breech breaks over the stock cure 3 as well.
Only bolt worth fitting is the cure 4, rubber tipped so that you can fire brittle paint in the colder weather.
Eteks are never going to be quiet with them being an open bolt.
you could try some different barrel tips with more porting to make it quieter if its really bothering you. superfreak kit?