I've done a number of grip fittings as I work in a golf shop. You might want to give the midsize grips a try.
Also you might try the Golf a pride MCC Plus4 as it might feel more natural and comfortable to you. The plus 4 basically is like adding 4 wraps to the bottom of the grip (right hand section if you're right handed).
Hope this helps a bit and if you have any questions just let me know