Any common accessory without craft and boss drops, lvl dosent mater u can add 90lvl ring to 20lvl dagger, resistances will not be added to weapon.

You dont tell us your race and class but from one skill you mentioned i guess youre str scout. My best advice: dont do it.

I dont know about knockback mechanic it looks to be depended on enemy type (or your race). Im pretty sure that changing vit to str dont make it stronger, but strange things may happen in this game. Beside that if u are str scout go full str, there is no enough lvl of str. But what i worried about is that youre can see that knockback even happen. Mobs in lower should die fast enough to dont give **** about knockback. Maybe that should make u reconsider your class and build choice, str scout is relict of the past.