Wow, you're speaking non-l2 here. There's no such thing as 'soulshot boost' jesus christ. ALL soulshots WITH NO EXCEPTION give 2x damage. The skill damage usually depends on the WEAPON'S patk, the patk given by the mastery, and the extra critical damage amount in case of skill critical (such as vicious stance, passives or weapon SA), not the patk obtained by BUFFS.

Icarus, I think (only at gladi) the skills' dmg depend mainly on skill lvl (power) and the receiver's pdef... And the weapon's patk show only minor difference.
But, please test it on your server, since I really want to know if this statement is true or not.

We're trying to set gladi's dmg on an l2j server, and I wanna use the original skill-lvl-damage ratio, and not some hand-made setup that would make him easy prey or unbeatable.

Any more suggestions?:S

It doesn't make your skill do 2x damage, of course there's a minor plus. But Sasha said a big stupidity, soulshots don't give more damage bonus per grade. I didn't exactly see might giving some solid damage in plus, so it's rather excluded. If it gave damage it wasn't more than 50 in any case.