I think 18 strength is fine for Lances, I mean, you get a two in one package, a pretty good throwing and melee weapon in one. Throwing in general is fine as it is with one exception.
THE. WEIGHT. Seriously, carrying 4 stacks of throwing daggers = running around with a Heavy Kuyak in your hands.
Dear Diary, today me and Negga stabbed two peasants in the arse with pitchforks so we could steal and skin the corpse of a moose. I gained a level in militia, so now I can peasant even harder, and I am well on my way to fulfilling my dream of becoming a master of the pitchfork.
P.S I also stole some potatoes from a nearby farm, they were delicious.