Thinking of upgrading my irons from AP2 716 to CB irons? Here's the thing tried my friends 714 which are in very good condition. Also tried the 716 & 718 ? I can't feel much difference of the face? Same yardage same shafts in all 3.. So do I 1. Find a set of 714 or do I 2. Upgraded to the new model? Any advise would be helpful.