Well I did not try either of those, but can you clarify what the problem is a little more and maybe that would help. Do you feel that you are having to grip with your left hand too much to easily get your vibrato? I think if you call or email Michael or someone on his team they would be able to ask the right questions to get you headed in the right direction. They are all super helpful! I ended up having to get a fully adjustable chinrest (kreddle) AND a Comford shoulder rest, because I was having pain AND the violin was falling out of my grip, but I honestly think you just have to be willing to try different things out..Bonmusica was my second favorite, though.