Ragnarok m: Questions on Size difference damage and gear penalty

[Light Kazuki]

Hey fellow Rom players. Just quick question, how to compute for size difference damage or weapon penalty on S- M- and L-size mobs?

Personal question: Meron po akong Minorous card(+25% L-size) and I have inlaid it on newly crafted Desert Twilight which is +25% damage to L-size mobs din. Though ang dagger may damage penalty(S-100%, M-75%, L-%50). Paano macocompute yun? or is it better to inlay it on Katar of Quaking na may 75% penalty sa L-size?

Please give your insights.