I wouldn't really change the arrow if they are grouping and working well.
What I WOULD change is the vanes and the nocks. Change the vanes for 2 reasons....if your going to shoot field or FITA the Quickspin is going to kill your downrange trajectory past about 40-50 yds. Another reason is unless your going to be shooting 3D ONLY your going to tear those vanes up pretty quick shooting a vane that large. Your going to want something with a lower profile. And I don't mean go to Blazers. They work for the hunter/3D crowd but they are going to be no better then what you have when it comes to getting chewed up. You won't find hardly anyone that know what they are doing or that is worth a darn shooting Blazers for field or FITA if you do....they probably won't be shooting them the next time you see them shooting
As for the nocks....put a bushing in those things and shoot a G style nock (I prefer Bohning F nocks over a G nock) or put pins in them and shoot pin nocks....otherwise your going to become a victim to the trap that GT has built in of not protecting their shafts on the back end therefore forcing you to buy more arrows