I am with Savage on this one. I would bench the pistol first and make sure it was really that high. Is this a new gun or used. If after re-checking everything you find it is still high, I would give Sig a call.
I have two and have been around a good number of them in my work. I have never seen a Sig P220 shoot that high out of the box.
I purchased my first one for a duty weapon, as the government would not allow the use of a single action auto, (1911) for duty. I have had great luck with the gun. With about any good 230 grn load, it shot dead on at 25 yards right out of the box. The second gun needed a small windage adjustment, but the height was good. I carried the first every day for many years until some genuis in Washington decided we all needed to use the issue weapon, a 9mm at that time.
There is hardly any finish left on that gun and I wouldn't even hazard a guess as to how many thousand rounds she has fired. It's never been broke or repaired and has never let me down. It's still pulling duty in my retirement, as my go to town gun.