So I was having issues with a 750 duel feed carb I have. I swapped it for a 600 I have and the car idles better but is richer at cruise. Its 12.5 now compared to 13.5 with the 750. Anyway I was looking over the 750 and the transfer slots aren't equally exposed. One side is .020 and the other is.030. What would cause that? Could that affect tuning?