I wouldn't bother about the final 30 points, really- they will be edited anyways when the 100 cap comes, and force builds are really better when you use them at higher levels, they are about the de-buffs, which you dont really get on low level.
Also, indeed, I dont see why you would go cold, the imbue is bad, worse, its bollock- just dont use ice when you're a full str :) you need the buff from fire (mag defence)
Cheers.
So in the end you should have this if you want the force :
Force 90/100 -- Fire 90/100 -- Bicheon 90/100
Without Force I'd suggest Lightning, for the moving speed.
Lightning 90/100 -- Fire 90/100 -- Bicheon 90/100