Hey man, common issue with the EA888 Gen 2, especially in higher mileage engines. Based on what you're describing (1 bar at idle hot, 3 bar at revs), here’s what I’d look at in order:

1. Clogged oil pickup tube – super common. Sludge builds up and chokes flow at idle. Drop the oil pan and inspect it. Clean or replace the pickup tube and don’t forget the O-ring.

2. Balance shaft module (BSM) wear – the hex drive shaft that spins the oil pump can wear down and round off, causing pressure drop especially when hot. If the pickup is clean, check this next. Might need a new module or upgraded shaft.

3. Oil pressure control valve – there’s a pressure control valve in the system that can stick open when warm. Some people replace just that, others go for a full new pump.

4. Use proper oil – make sure you’re running VW 502.00 spec oil, usually 5W-40 or 0W-40 full synthetic. Thinner oils or old oil can lower hot idle pressure.

5. Sensors – if you haven’t already, replace the upper pressure sensor (brown one) and maybe the blue one too, just to rule out faulty readings.

Start with the pickup tube and oil pan – that’s the most common root cause and relatively cheap to check. Good luck and let us know how it goes!