Hi guyz

I'm having an issue with throttle cut and it's always happaning araound 6000 RMP but i can't figure out the reason behinde?

The car have following mods

K04 0015XL
Bosch 630CC injctors
265l/h feul pump
Froged con rods

I'll attach log made with ME7logger

From what i've been able to determine in that RPM range the air fuel mixture becomes lean for some reason. so i'm not sure whether it's a mechanical issue or perhaps a tune issue which i made myself.