SK Piercing Skill

[Jshaman]

I see this question asked elsewhere, but can't really find an answer....

I've been using a 2hp item on my SK but recently realized that the skill only goes up to 210. Is the damage difference between a 210 skill 2hp and a 225 skill 2hs enough where I should switch my weapon out (assuming equal damage ratio)? Would a 2hp with a slightly better ratio still be worse than a 2hs?

I can't seem find the formula for how weapon skill impacts dps, but perhaps I'm just overlooking it. Thanks in advance.