You just need to be more conservative with the settings, I would add 0.1-0.2 everywhere to the base boost, because if you are for example in 6th gear and pushing for a long time it will be higher etc.
You also start run very late, try 6th gear 1000 RPM WOT and do this until 2500-3000 rpm or so. Then you have actual real data for low RPM.

I am sure ECU is behaving correctly. BTW it's also totally normal for it to go WOT at part throttle if at part throttle you are requesting more boost than turbo can possibly provide. This is whole idea of the map.
But you must set it correctly, not on the limit, otherwise result will be very jerky behavior. When it is set correctly you can't feel anything when it goes for example 40% to WOT, because it does not change anything.

Today spent almost all day trying to make new KFVPDKSD/KFVPDKSE work, but no progress at all. Done WGDC=0 pull with heavy trailer. Still unexpected WOT at low requested load, at 3000-4000rpm. For example, set maps acording new log, still nothing.Add 0,2-0,3bar -the same WOT. Multiply vpssplg axis by 2 - absolutely no changes.I think something messed with vpssplg axis, or wrong adress ( 0x130EC ). Atached original 018J KFVPDKSD/KFVPDKSE maps in Tunerpro, where ir no mistakes, maps/axis looks like it should be?

Are you sure you did not mix up X and Y axis?