I shoot two fingers under, index and third finger, a lot...I have tried index above and third below, which I have heard called a Flemish release, but never worked with it much...it seems to me that style of release is the most logical and thanks for reminding me to work on it...I make tabs for two under by inverting a Cavalier Elite tab for the opposite hand and then cutting off the leather and aluminum I do not need...I shoot both right and left handed that way...the truth is I would shoot one finger under if I had the finger strength required...it just seems reasonable to me that the less there is in contact with the string the cleaner the release, kind of like a mechanical release
DDave