Better question is do you have enough other gear to build a good Sanguine Blade gear set? The MAB +7 is not enough boost to the base damage by itself to make it worth using. I have the gear to build a set for it but don't have all the inventory space.
If testing is correct:
2 MND = damage +2
3 STR = damage +2
1 INT = damage +2
With MAB being its normal % increase. If you have a good Chivalry set you may be able to use that for this WS.
Crimson Scale Mail will add 30 Damage (10 from MND and 20 from INT) and that is a better choice if you are not at over 402 damage before the MAB is added. (402 * 1.07 = 430.14 )
Brytor - Sylph
LS: Legion of Altana
90 PLD, BLM, RDM, WHM, SMN, DRK