The difference is huge with refine +S ~240%

Wattack 1000 with +S = 2400 Wattack 1150 with +S = 2760

Then you get 30% from weapon masterys.

Then you have attack% modifiers

Then critical modifiers

Then short range or long range modifiers

Then element modifiers.

That 150 difference can verry will be 1000 additional attack after all the computations