Ok So You Taunt constantly (Do you use hasten and three recharge reductions?) With 6 taunt enhancements the recharge time for taunt is 3 seconds and its activation time is 3 seconds. With hasten you can cut it in half or close to 1.76 seconds. With 6 Recharge reductions and hasten you can get it down to .75 seconds to recharge = perma taunt.
The only reason I slot taunt with rchredux is so when i'm in granite it comes back quick enough to use it on something else. A lot of the shit I do (dropping 3 slots into Swift, for example) is me trying to work around the limitations of granite. I don't think it's worth slotting with recharge redux if you aren't a stoner, doubly so if you also have Provoke.
I can't count on my attacks to hold aggro. If i'm tanking +5 mobs I can't assume that I'll be able to hit them regularly. My aura (mudpots) helps me hold aggro, but it pulses. The Invuln aura (invincibility) is always on, so if you run by a mob you will grab their aggro, Because you don't do damage to mobs, I would recommend taking provoke and three slotting it.
That last statment I don't understand.

If you have a hard time hitting mobs to hold aggro, assuming +5 mobs, do your mud pots need to hit? or do they work just like my invincibility and "always" hit with the provoke? Also if my Incincibility always provokes then wouldn't that work better than the provoke power that needs to hit? The reason that I am taking provoke now is so I can spam taunt/provoke constantly in diffrent directions. When I get Incincibility I should hold mobs in melee with me and then use taunt to get the outlyers, thats just how I thought it would work, but you and Mei Mei have more experiance with it. Am I wrong to think that Invincibility will hold mobs to me?
Thankfully Mud Pots is autohit. I learned today that it actually has two functions, first it's got an aura like invinc, and second it does damage which punchvokes. Invinc just has the passive aura. The problem is that invinc is the worst of the tanker aura powers at holding aggro. If you're handling a small team, with a max of 4, you can probably hold the aggro. When you're handling a large team, lots of damage is being done to the targets and they might peel off of you. Additionally, as you fight higher level stuff, the duration of the taunt will be much shorter.
When I first started fighting Nemesis in PI, I could barely hold their attention because they were 43 and I was 37 (or less even). I had no problem with the damage they were giving me because my resists were capped and they weren't debuffing me. The problem was that every time someone else shot them, they'd leave. Taunt kept them around, but after a couple seconds they would get loose again. If I had provoke properly slotted (2acc, 1 taunt is my guess), I think I would have been fine.
What you should do is determine what kind of tanker you want to be. Wth invuln and some secondaries it's possible to solo effectively. If you're going for the consumate team tanker, I would recommend provoke. When I give advice on these sorts of things my own beliefs cloud my judgement and I error on the side of holding aggro and away from sustained DPS or other things. Generally speaking Mei Mei is completely devoted to holding aggro. GH is only partially slated that way and I am thinking about respeccing to make him able to hold more.