Wouldn't Moonshade Earring with atk+4/TP bonus+25 be better than Vulcan's? Provided the neck/belt are Dark/Soil/Light Gorget/Belt.
Assuming linear progression between 100->200 tp, the tp bonus+25 should add 0.0234 fTP across all 4 hits. Or, ~.094 fTP to the WS.
This increases the WS from 3.8 to 3.894 fTP, a ~2.5% increase in dmg before calculating DA/TA.
Whether vulcan would win depends on the dmg rating of the polearm in use.