Hi guys

Need advise on air fuel ratio on my 16v turbo modified
I have gt28/71 turbo
630inj and 3” full exhaust
Big intercooler and more
Also one ecu with FLEA CHIP
I have rich ratio on daily drive I have AEM WIDEBANDguage
Its show me 10–10.5 this is very rich
But when drive full thorotle and turbo kicks in orotund 3800 rpm up to topI have 11.5-12 on gauge that are good

Try to replace fuel regulator and same resolute

Any indie where to go next ?,