Replying to Tuning/De-Tuning

Alright so last year i bought my first pair of twins, when i bough them i got them waxed and i didnt have them do anything to the edges, i was told to dull them as much as possible so they dont catch on rails, so i got home and took a rock to em.

So next year i bought some Dumonts, and i was thinking about mounting and tuning etc, im center mounting since im going to use these for 100% parl. and i remember last year the guy at shop said he can sharpen just the tips tail and nose so that i can carve and the mid still wont catch on rails, i was wondering if anyone has any experience with thisa and wants to tell me there opinions... thanks