Hesitation, possible fuel issue?

[PrimerPLus]

Well I have been trying to figure out what my throttle hesitation is. Basically taking off I get hesitation. It is not a smooth transistion while doing WOT. If I do just nice and easy no problem. It is very annoying and I have experienced this for some time and just thought it was because of my very old fuel filter or maybe my Aeromotive AFPR as I have heard stories about them not seeting right.

Well I have a brand new FuelLab fuel filter that was just recently put on and I just got done taking apart the Aeromotive AFPR and there seemed to be nothing wrong with the diaphragm and seemed to be seeting correctly.

I have not ever had pressure last after shut off. It goes straight to 0.
But as I said I chalked it up to either a bad fuel filter or something wrong with the Aeromotive AFPR A1000. I have ruled these two items out now.

Also during this hesitation you can see the wideband go rich to lean back to rich during this while WOT.

Any ideas on what to check? Fuel pressure is at 42.5psi, as soon as the car is shut off it drops straight to 0 in a matter of seconds.

 

[PrimerPLus]

I ran seafoam through the intake and turns out I had an exhaust leak right where the o2 housing and down pipe meet. I thought I had fixed thus before . Well I put high temp copper RTV on both sides of gasket and hammered down the bolts and nuts. Let it sit to dry for 2hours then started it up let idle for 20mins and ran some seafoam. I could not see any coming out accept at the end of exhaust pipe where it should be.
After this I noticed my a/f gauge was rich at idle like 12-13, I redid the idle tune.
Now the car seems to be steady. I think I may have been too rich? I need to do cruise and WOt pulls now.