Some times the way you have your gun set up can show what you think is high pressure. A long chamber, rounded type ejector, being over gassed and not the right buffer and buffer spring setup. Add all four together and you will think your running hot when your not.
According to my chrono 28.8grs of AA2200 with Hornady 110 BTHPs is not much hotter than the factory Hornady 110 BTHP loads.
I have three 6.8 guns. One gun showed real bad swipes when the other two looked fine with the same load. I changed out the rounded ejector for the flat type and added a Tubs SSS buffer spring and closed down the gas port a little. The bad swipes went away.