Do not do Spear on any phase, form or type! Styx needs to fix the viability. AP-to-DMG sucks, heavy downgrade from Sledge with same stats, basically, and costs more AP to do less damage, have no viable feats, and has to do it with more stats spent.
FYI, I went the absolute max spear AoE dps that I could ever do, and I still ended up doing only grenades to survive.
DO NOT -> try spear throw, it sucks on any difficulty, has zero dependability, and has a shitty cooldown, even if boosted. Just don't!
Throwing, and dex-wise, knives are fantastic as support or leeching some extra AP on kill, but... do not do that either if you respect yourself, just respect the natural Molotovs and Plasmas before you get excited.
NOW --- what I suggest is you do some build that has enough STR for assault rifles, agi for Sprint, and Jedi-self-haste stuff, and pick Concentrated Fire feat for damage for rifles, to win. Anything becomes obsolete at that point.
Do a legit playthrough with a legit weapon.