You should raise WDKUGDN a bit
Wiki covered it

Bullshit.
BGSRM has nothing to do with it.
100% useless spam answer like always.

You understand wrong. KFMSNWDK and inverse KFWDKMSN are physical maps that define the throttle flow at pr = 1.
There is absolutely nothing to "adjust" here, you use the correct values for the throttle. If you use the original throttle, don't touch it. If you use a different throttle copy the values over from the stock ECU for that throttle.
If your VE is different then what you have to adjust is WDKUGDN only. This defines the point where the throttle does not limit flow anymore.

Look at FR and learn.
If your throttle is the original one, the only thing you need to touch is WDKUGDN. Once again - KFMSNWDK and KFWDKMSN are not "tuneable" maps. They physically give the flow of the throttle valve at PR 1.9. They are made on a flowbench, because it doesn't matter if it's a flowbench or an engine or whatever else. It's simply how much a physical opening flows.

For a NA engine it is corrected by pu_w / ps_w and for a turbo engine it is corrected by pvdk_w / ps_w.

P.S.
PR 1 in previous post was typo, I forgot the .9.
It's basically what the throttle flows when the pressure before the throttle is 1.9x the pressure behind the throttle. It's a physical constant relating to maximum flow because after that the flow hits the speed of sound and does not increase anymore.