step back to old school and how we did it before "traditional" carbons,,,,,, get a roll of weed wacker line and pull the nock off the back of the arrow and feed 1 to 4 weedwacker lines inside until it hits the insert up front and then cut them so about a 1/4" is sticking out the back and then push the string nock back in and weedwacker line doesnt not effect spine (or never did for my bareshafting) you can put 1 to 4 or 5 until you get the weight right,,, where your worried about spine this might work for you in a pinch..
I had 2 morrison dakotas and they where loud with 10gr an inch for me (until I got FF strings with padded loops) not sure how loud your bow is but I know it will be quiter with a heavy arrow and you won't split a limb up the middle and void your warranty.
for hunting the real thing I'll opt for quietness over speed all day long but try to find the perfect mixture and I use heavy inserts and heavy points too.