Just a thought, if you have someone check the loft of your old wedge you wll probably find that it not to spec and actually stronger (52 or 54 degrees) which would mean that the Vokey will not fly as far.  I check my loft's of all my irons at least two to three times a year and always find one or more out of spec!  My last check up discovered that my 9 iron was 2 degrees strong and I was wondering why it was going so far! LOL, just my two cents! Good Luck