[Fluid]

Why do you want to adjust the boost pressure, your chip program should regulate the boost pressure.

Also, a boost gauge is pretty much always a big help on any turbo car. The best gauges also have a peak hold function where it records the peak value reached. This lets you see spikes too fast to see.

2nd on both points, the chip should control the boost. Some people add a boost valve to control spiking or fix a problem but check it with your gauge, it should be fine. The reason why a boost gauge isn't on every car is because customer A says "how come customer B's car makes more boost?". It depends, two identical cars will just make different levels of power. Same thing with the water temperature gauge or oil pressure gauge.

 

[Fluid]

so what's the point of a boost gauge if vag com is so much better?

Because your vag com isn't plugged in all the time. A boost gauge is. You wouldn't want to drive around with a laptop in the passenger seat, it wouldn't last very long before breaking.

 

[Fluid]

Small spikes aren't bad but larger ones aren't optimal. The first graph is fine, the 2nd and 3rd are not horrible but are still bad. Try 1 turn longer on the actuator and see what happens. Are you stomping on it only low in the RPM range? It should be more stable if you are at low load, medium RPM and then stomp on it instead of stomping on it at low RPM.