How did you determine you needed another 1/2 inch and a 1 degree change? I just ordered a new set of Epic irons and my clubs will be 1/4 longer than normal due to my height and swing. I also added 1 degree but on trackman it showed I was hitting the 7 iron 1 degree or 32 degrees not 31 on the strike. The 1 degree change was not to juice the clubs but get me back to where I needed to be on the launch.
It will be interesting to see what others say espically the Callaway guys.
someone correct me if I am wrong but I believe that adding 1" changes the lie angle by 2 degrees Flat. A 1/2 Inch decreases the lie by 1 degree flat. Therefore you would need to add your desired 1/2" and bend 2 degrees upright to gain the extra 1 degree you are after, by only bending 1 degree up you are bending the iron back to the baseline lie angle before the length increase. Lie angle is pretty important IMO and shouldnt be overlooked. You can tell when the lie angle is off. You wont have a problem bending the CF16 2 Degrees.
Adding an extension will also increase the swing weight of the club. You may want to consider adding some counter weight to the butt end to compensate, but that would increase the total weight of the club.
Swing Weight is one of those things I think is a little "hokey" I think 95% of average golfers will not feel a huge difference, whereas the majority could feel/see lie angle. It just looks off at address. Also I dont think the average golfer is exposed to things like lie angle/Sw unless they are fit for clubs. The majority buy off the rack and have 0 clue that bending a club is even an option, let alone knowing that adding a midsize or jumbo grip can add 10 - 15 grams of extra weight and throw off SW. Most golfers (I'm generalizing) have no idea until they are told or read about it and then become concerned with it.
I did some club building last year and made it a priority to have a well balanced club. I searched high and low for brass and plastic tip weights for my Irons. I went to every local golf shop and even called Callaway CS. 9/10 people I talked to had no idea what a tip weight was and no one stocked it. I got so fed up trying to find them I built the set without them and found no difference in the set I built vs the set I ordered from Callaway.