Meyer 6m tip opening

Someone let me borrow their older Meyer 6m and I really liked it. It had the perfect tip opening size to switch from my metal 105 Berg to the Meyer, and the mpc played great. Well, I had to return that mpc to my friend and I bought myself a Meyer 6m from wwbw. This one does not feel like the other one at all. I think the tip opening may be smaller because It sounds less bright and doesn't play as well. I can't put as much air through the thing, either. I can barely switch between my Berg and it. Am I better off wasting over $20 shipping on a $100 piece sending it back to wwbw and getting a bigger opening like an 8 or 7, or can I get the thing refaced or something? Thanks a lot for your help.