Punch the 7mm08 Ackley.......
That'd be my recommendation as well if a guy wanted more than the 7-08 in the 84M.
OTOH, I can't fathom the point of more than 7-08 in that little rifle.
There really not need be a point about it, other than you will get some additional speed, if not quite a bit ... as well as brass that never has to be trimmed ...
I just had my LVSF 7mm-08 torn apart and had a Rock Creek bbl put on, chambered in 7mm-08AI ... it feeds perfectly, and I'm getting a hair over 3300 fps with the 120 TSX and Vmax ... VERY HARD to not like that ...
to boot, the recoil feels the same as I recall it when it was a SAAMI 7mm-08rem ...
but yah, I can't argue your point about it not being necessary ... close to 3100 fps with the SAAMI chambering, or up to about 3300 with the Ackley ... either way, you're good to go ...
