High RPMS lean condition

[321]

What's up people, I could really use some help with tuning. I am getting a lean condition at about 5,000 rpms. I have tried richening up with the afc, but still remains lean. Everything will be fine until that rpm range and then i can get as much as a 30 count of knock. This happens with 13psi or greater of boost. Any boost level below 13 everything is fine. I have done a cumbustion chamber service not long ago, a induction service, tune up, and checked for boost leaks. I do have a very slight boost leak between blow of valve and flange, however; I do not think that is causing it. I have read that timing should be set at 5 deg. If this is true wouldn't a car with the afc turned way down to componsate for larger injectors have way too much timing in upper rpms. I don't know, please help if you can. Thanks

 

[hottboost]

Keep in mind Im still new to tuning but I would think its a boost leak. Or at least fix that first so you know for sure thats not it. I would do that first. Also what are your afc settings along with your mods and can you post a log.