depents on your playstyle
if you are melee and can hit all the time holding 100% deter is no problem
but dont completly ditch profi cuz you first have to deal damage so deter can start stacking up
atm iam still trying there but in the end it seems iam pushing deter more and more
alread 50% of my statpoints are in and seems like i could take even more
if you manage to hold up deter 50% + all the time, ideal would be primary stat deter and secondary prof (special glyphs); this way you would also have your "base" prof you wrote about
(usage of brutality is questionable in pvp due to so many healskills& various barriers etc)
however the soon as you are below 50% you are in a bad position
ccs or fleeing / shielded enemies also make it hard
maybe as (melee)warden with outgoing offheals its different, i havent tested this yet as warden