it depends on how you like to ride. i like going in while applying some braking in the corners and then power out of the corners. it sounds like you like railing around a corner without slowing down. the problem with that is when you have traffic coming towards you you end up taking there side of the trail. i on the other hand end up hugging my side and then when i know it is clear i power out of the corner. this is were the traction is needed the most. for sure a good track like you have MAC does make a hugh difference when the snow is loose to firm.
try 120 and if that's not enough, like you mention add more