Cody,
Like you I had shot split finger all my life. About this time last year I decided to give the three under a try myself, for various reasons but mainly to see if I could shoot better groups consistently. I have always read that three under shooters typically have a higher nocking point than split finger shooters do. Not true for me. I currently own as many bows that were tillered for split finger as for three under. I can't see or feel a bit of difference in them.
However.......I did notice that they were louder when I shot three under. Before going into what I did to remedy the situation for me let me add that all my bows are at least 62" long and several are 64" long. I have a 29 1/2" draw and the longer bows just seem "smoother" on the draw for me.
I am not saying that what I did will work for you or anyone else.......so no guarantees.
First and foremost for all my recurves except my Dakota Pro Hunter that came with female velcro in the string grooves on the limbs, I bought a spool of merino wool yarn and I wrap the ends of the strings from about two inches below where the string first contacts the limb itself. I wrap them all the way to the nock loop and make a pass around each side of it and then wrap all the way back down to BELOW where I started on the string. This elimnates, or at least limits the amount of "slap" that happens when you draw and release the arrow.
I tried all kinds of different types of silencers on the strings in different locations. What I have found that works best for me is the musk ox silencers that are available located at 1/3 points on the string. If this still doesn't quite get it as silent as I would like I then put some beaver fur silencers at 1/4 points in addition to the musk ox ones.
There is one more thing that I have tried on my takedown bows. If there isn't anything between the limb and the riser where the limbs attach I take my string wax and give it a fairly good coating on the riser and re-attach the limbs with the limb bolts. I'm not sure what this does, other than hide the sound that they make when the move on each other, but it has taken the last bit of noise out of all the bows that I have.
One more thing that you can sort of "fine tune" with on noise is this..........................
Find out your bowyers recommended brace height and start at one end or the other and go through the whole range of recommended braces. This will really surprise you as to eliminating that last little bit of "noise" that you are hearing.
I hope this helps.......
Winterhawk1960