Glad I am not the only one who thinks that. Tho I would only use Onyx over Ares, black and ares is probably too close that I would just use ares for the added dex so I can drop some acc in other slots.
As for the OP. You should aim at around 410 in acc for ws. Your ws acc should be slightly higher than your tp acc. I find that moogle addon helm with 25 acc help a great deal. You lose 0 att from switching heca cap, and just 7 str difference. It enables you to use onyx legs (5 str) with your set and still hit that 410 acc mark. You will also be able to use a bombcore instead of bomblet if you have too much acc. Overall, str doesn't do much for guillotine, and your fstr should most likely be capped anyway in those situations that you mentioned. Attack is the way to go.
Edit: this also allows you to use justice torque (if you have one and feel that 4 acc from gorget is better) over snow gorget and perhaps swordbelt +1 over warwolf providing you don't need the 5 dex for acc reason. Onyx feet over heca feet as well. Str is not so hot for guillotine.
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