“Adjust” petrol pressure regulator

Hello, I am already really eeeeeviger silent reader and even though nobody has noticed, thank you for the many valuable information that you can also pull out of the forum as a non-registered one! Nevertheless, a concern where I have not really found something about it: My V70I T5 shawl has received some modifications. Be it Green Giants, LLK, Japanifold, 19T, DP, AGA and stronger petrol pump. Tuned and so far so good, good pull and everything perfectly normal. If I drive at 40/50/60 km/h, uncouple and then roll to a crossing without gear, most of the speeds remain “hanging” between 1500 and 2000. Only when I come to a standstill it goes down and zack comes – in the stand – then the error message (I think 144 – idle control). Idle controls have also been tried three different (yes the correct ones), no difference. The only possibility we still see is, u And that just a few days ago, I remembered that my petrol pressure regulator was drilled a bit, because of increased fuel transport through the pump and for the larger ESV. Is this Lege artis, or rather not? And if so, is there perhaps a more professional one with an adjustable petrol pressure regulator? Thank you!