I shoot and have shot 2-1/2" Bi-Delta vanes for over 20yrs and love them. They at one time held the broadhead worlds longest shot record. I shoot them with my 100grn, 1-3/8ths cut GrimReaper broadheads out to 50yds without a single issue.
I glue the insert with the broadhead inplace and align the vanes with the blades. They shoot great even with 3 and 4 blade 100grn Muzzys.