I used to hit a 45 inch 910D2, very consistent and controllable, but too much spin. I was fit into a EPIC SZ at 45.5 inches. Fitter saw no real value to reducing the shaft length. While I am getting comfortable with the longer shaft, I have still not gotten back to my previous level of control or confidence.
Find a better fitter. No am's should be playing a driver that long. Shortening the playing length is the best way to help with consistency and control issue.s
If I read above correctly, I will need to add 6 grams to the head to have consistent swingweight. Do these rules hold for a driver?
Those rules were never meant to be used in the context of adjusting SW after changing playing length. Or more accurately, those rules are for adjusting SW but maintaining the same SW at different lengths (or in the context of many other changes) does NOT mean maintaining the same feel.
Just follow the tutorial here on adjusting length and swing weight and you should be fine.