The drop in the low pressure side coincides with the high pressure side creeping to 140bar - unsure why the car is doing this but certainly is not the issue. Everything else looks good, load, MAF looks bang on too for a K03 etc.
If it were my car, the next thing I would do personally is remove the vacuum pipe to the actuator and take it for a drive, with the laptop on and keeping a VERY close eye on the boost reading. In theory it should drive exactly the same in terms of peak boost and performance, but there's a chance it could not and you could see turbo shattering boost levels at lower rpm
I'd also go with checking the wheels for any damage, melted tips etc. as its fairly easy to do, and if they look OK and the pipe removal yielded no significant change, I'd re-attach it and then add a fair bit of preload to try it out and see how you get on - you can always back it off at a later date if its a little much
19PSI peak with 100% N75DC (based on previous graph/log), without a leak, is definitely a turbo problem. This little turbo could easily peak at over the MAP sensor limit of 1.5Bar by 3k RPM if all were ok
Also, just an FYI - my K03 2+ can hit and maintain the requested boost levels in this map, so they are achievable and are what you should be aiming for