I got similar velocities with RL17 when I started testing it in a then-new 30” 6XC build late in 2008. Was using DTAC 115’s at that time, LR primers literally fell out of just-fired cases. Later load testing had me settle on Berger 105VLD’s and 8208XBR.
Did you notice any reduction in barrel life by using 8208? This is the only concern I have with trying a faster powder. It’s a minor concern to me as I use economical button rifled barrels inside 600 yds. The 6xc will burn out a cut rifled barrel almost as fast as a buttoned rifled barrel, but the button barrel costs about half the price.