Sacrificing .79 DPS for 507 HP

[Gamemako]

Unless they define DPS as something other than "damage per second", sorry bud - but that calculator blows.

You would be wrong. Valk's calculator has been repeatedly shown to be highly accurate. The problem is that OP is using "DPS" without stating what Valk's value there even really means. Valk's calculator just calculates DPS as a function of repeated attacks using a given potency. There are separate comparisons for autoattack and weaponskill DPS because they do not use the same formula (Determination is vastly more valuable to autoattacks compared to weaponskills). It is likely that OP just left the WS potency at 100 and reported the DPS for that alone.

A more accurate way of describing the scenario would be to state that you see a 1.26% increase in weaponskill DPS. You could provide a comparable number for autoattacks as well.

//EDIT: Yep, tossed the numbers into the calculator and that's exactly what OP did.

//EDIT 2: Yeah, so it's 1.27% WS DPS and 4.83% AA DPS according to the calculator. Depending on the exact DPS weights of AA versus WS (I don't know for sure, I will estimate around 25% of damage is AA), you'd expect an overall increase in DPS of about 2.1-2.2% in exchange for the 507 HP.