General Question for SAFC tuning gurus

[DSMTalonAWD51]

Alright, so I have a question about my log. Let me say that I first started tuning at 11psi. I was getting like 28* of timing by redline and couldnt get little dips out of the curve. So I added some more fuel and raised the boost for around 18psi to send the ecu into a higher airflow timing map. It worked great, brought my timing down to 19 at redline, the car pulled strong (even though I know its a bit rich)

Now, heres my question. Looking at my log you can see that when I reach full boost my timing goes all the way down to 0. I can definitely feel this when im driving. When I reach full boost the car hesitates for a split second and the exhaust sounds like its getting rich stutter. It might even be a split second of fuel cut but I cannot tell for certain. But after it pulls hard and according to my timing im not getting any knock after.

-First of all, has anyone experienced this?
-Second of all, do you guys think all my timing is getting pulled from knock or from too much airflow?? I am wondering if leaning it out at 3k and 4k will help this or not. But I dont want to lean it out if its knock because I will be doin some damage.

These are my safc settings: -25, -24, -23, -23, -24, -25, -26
This is on 660s, b16g, 18psi
Sorry long post, thanks

 

[CanadianTSi]

Lean it out 5% from 3-4k.