well iam not a psi but in general i think all dps classes should run around the same
normally ppl said to get 50:50 ratio of profi and bruta but well if you want my opinion put a few points in determination cant hurt cuz in pve and pvp you will get damage so i think try stats like:
40%profi
40%bruta
20%deter
in pvp you should probably run even more determination cuz you will be a focus target and when you have a high determination value you ecto barrier will be insanely strong
but alltogether my tipp is just try it out

you can buy insignias from your profession trainer (tailor,lether,blacksmith or weaponsmith) and they just cost a little bit more than 1 gold so you can change at will