From what I recall from MNK gear threads, those who used tantra for TP were laughed at.
He was asking WS. And tbh, tantra for a focus down set is acceptable, though mantis eye is easy to get for all but the most VW-phobics.
As for WS..
Assuming 440 skill for 48 base dmg, lv90 veret for +35, puts you at 83 base dmg.
Going to use this as an example set for the math..
.
Assuming also 100 base str.
Dmg 83
Str 100+82 (including the 2 str present in both pieces, counting +2 str from tantra vs +5atk from thew.
Atk 571
Stats in question = 2 str vs 5 atk (2 str giving 1 atk, reducing the open attack difference by 1 so as to simplify things).
182str = 109.2 dmg, 192 dmg total on WS before
http://fTP.
ftp 2.25+3)1.08 = 5.67.
Dmg on VS = 1088.64.
Atk on VS = 571.
+5 atk: 5/571=0.88% increase.
+2 str: 2str = 1.2 = 5 dmg increase after rounding then
http://fTP.
5/1088=0.46% increase.
Overall: thew wins in acc capped situations. For uncapped tantra will win - but mantis will often pull ahead of both if uncapped acc.
Edit: Fixed a couple of typos.