If you like the dental floss belt, try mylar tape, like VHS tape spliced to the correct loop length.
The Teres owners group have been down this road with the various belt types, and have tried the rubber, dental floss(silk cord), etc, and at present the 1/2" mylar tape is the best thing found.
You may have to try a different pulley, if your pulley has the V-groove in it for the round section belts. Tape requires a flat surfaced pulley, with flanges on top and bottom.
The Teres owners group have been down this road with the various belt types, and have tried the rubber, dental floss(silk cord), etc, and at present the 1/2" mylar tape is the best thing found.
You may have to try a different pulley, if your pulley has the V-groove in it for the round section belts. Tape requires a flat surfaced pulley, with flanges on top and bottom.