You might also try 29.5 to 30 grains of ar comp with 70s. I shoot 70 ballistic tips over 29.7 grains of ar comp out of my 22" 10 twist 6x6.8. That load is just shy of 3300 fps. 30 grains is hard on primer pockets though. 70s really pick up any of my slack.
I can verify that 58gr vmax will smoke a deer from a 6DTI or 6x6.8. I shot several as well as did my brother and all just crumpled. That much energy dumping into their neck is more than they can handle
"Gotta sale a Dtech" Ha, preposterous!!! Seriously good luck which ever route you choose. I've only got one Dtech, but I'd love to have a second, perhaps a third.