The better arrows will tighten your groups, but if the speed dial is off, they will still be high. I would shoot the worse arrows you have to dial that in as close as possible, then tune the grouping with the good stuff. If you have 4" grouping at 50 yards, it's time to shoot better arrows once you know it is not you, or the bow! If that sounds harsh, it is not intended.
It’s not the way you rock, it’s the way that you roll!
Have you tried adjusting your speed dial at 50yards or 60yards? If you're out just a bit on your speed dial you may not notice it at closer ranges but that bit of difference will be magnified and show up at longer ranges. So, shoot your arrow at 60yards then put your 60yard chevron on the bullseye and adjust your speed dial until your 60yard chevron is on the arrow you just shot. That should fix you up.
Paul
You're only paranoid if everyone isn't out to get you.
Keep your friends close and your enemies closer.
My enemy's friend is also my enemy.
Update on my scope issue. Went out today and shot at 50 yrds, shooting high so I adjusted speed ring up until I was hitting bullseye. Shot at 40, dead on, shot at 30 still good to go. So I guess I have that dilemma solved for now. Thanks to everyone for their suggestions/advice. Yes I did order arrows from Jerry of South Shore Archery. Going to keep shooting the GT's and get my broadheads sighted in just in case I don't get my arrows from Jerry before hunting season starts. Thanks again.
Al