I have carried out all lambda test/cat test and all pass ok . Took another log to check injector time and max is 18ms so its not a weak pump or filter . My bet is MAF as the log recorded max of 180gs . Boost matched requested at 1.2 bar .

MINE IS A 1.8T BAM . So the reading mine gets is acceptable at -2 ?  

Car was running great until i had new timing belt kit fitted. May just be coincedence , but here is the story.   I have torque running and noticed car felt less responsive and heavier on fuel so did log.  on previous logs timing pull was no more than 6 after 5800 rpm and maf reading was approx 205g/s at 6100 rpm.  My trims were normally -0.8 and -3.9 . Now trims are are both at zero (havent reset them) . Now its pulling up to 9 degrees timing from 5.5k and the corrected load seems to be being pulled too . Now peak airflow is about 191g/s . Have done leak test and no leaks . My two ideas on cause would be a failing maf (a brand new oem one fitted about 16 months ago) or the timing is out after belt change.  I have attached the log i took after belt change. Any pointers would be a great help. Thanks . Oh boost requested is 1.2 bar on map.  No fault codes. I also put stock map on and trims are the same after two days or running (they would normally be 0.8 and -3.1).

Have you tried a throttle adaptation

thanks to all help . After ruling out belt , lambda etc . a failing MAF was the culprit . Fuel trims back to 0.2 and -3.1  and maf full load log was 206 gs