Game Mechanics: 2-hander delay bonus

[Pudge]

Hi, a 60 warrior hitting a sitting 58 sk with:

oggok cleaver (44/60): 277 damage

weighted axe (45/150): 312 damage

should this be the way that damage bonus works? seems like a really weak increase in damage, for being over twice the delay. the extra 90 delay yielded only 35 damage. actually even less than 35 damage because the axe has 1 higher damage than cleaver. so... working as intended? or no? about 1 damage per 3 delay