Taunt attacks?
I'd replace the one in Haymaker at least. Probably both if you're using Jab as a main attack.
Generally, there's not a large call to put Taunt enhancements in damage dealing attacks, certainly not at the expense of damage, accuracy, endurance, or recharge. The enhancements only mean that the Gauntlet effect lasts longer than it would otherwise.
The exception would be those attacks that do no damage, like Fault or Hand Clap. Since taunt auras no longer accept taunt sets, these attacks are probably the largest places to put them outside of Taunt itself.

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I'd focus on endurance, recharge and accuracy in your single target attacks. There are lots of other ways to taunt... invincibility, on it's own, is rather huge in that regard.
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The exception would be those attacks that do no damage, like Fault or Hand Clap. Since taunt auras no longer accept taunt sets, these attacks are probably the largest places to put them outside of Taunt itself.
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hm, someone could easily misunderstand this. While taunt auras (most of them) no longer accept taunt *IO SETS*, you can still slot taunt auras with taunt enhancement (and many people do).
To the OP: I have never slotted taunt enhancers in an attack. I'll put them in Taunt, taunt auras and, occasionally, a non-damaging AoE as Heraclea mentioned. And by "occasionally", I've done it once.
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Yep, definitely replace those taunt enhancements from your attacks, the few seconds you'll gain aren't worth the loss of functionality of the attacks. Your attacks are far better served by first making sure you hit (accuracy), second making sure you deal enough damage (damage raises your threat level helping you hold aggro) and third making sure you have the endurance to keep swinging (endurance reduction). Once you've done all that the fourth on your list would be recharge so you can attack faster. As you may guess, this doesn't leave you any room to increase the duration of your Gauntlet effect, which is already around 13 seconds.
Oh, and Invincibility should first be slotted with defense buffs, then tohit buffs, then finally endurance reduction. If you're slotting set IO's or you're able to slot Cytoskeleton Hami-O's (level 47+) then you may have room to toss a taunt duration in there but remember the defense comes first!
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I have been running my Inv/SS tank with a taunt enhancement in both jab and haymaker. I gust made level 18 and now have invincible and was wondering if I should keep them slotted with taunt or if I should replace them with something else?