I recently found that I can get a better sound (gripping of the strings, volume, clarity) by resting my thumb under the frog when bowing - I think this is an unorthodox technique (?), which may also lead to stress on the thumb, if prolonged. However, if I start / warm up this way and then revert to the thumb resting on the stick, next to the frog, it seems to help with my right hand bowing technique. Just wondering if anyone else has experimented with holding the bow by placing the thumb under the frog - and if so with what result? Are there any DB players using other "unorthodox" bowing techniques? Thanks for reading!