ᐅ Exterior wall Ytong 40 cm Thermoblock vapor diffusion / dew point

Hello,

I’m not entirely sure what I need to pay attention to with this topic. It would be great if someone could help me here.

First, some information about the building (shell including roof completed):
-> Exterior wall: 40cm (16 inches) Ytong Thermoblock
-> All ceilings are concrete (including the top floor ceiling)
-> Interior walls: 12cm (5 inches) Ytong
→ Mechanical ventilation system
→ Underfloor heating via heat pump

Attached is the construction as planned and also as recommended by Ytong (exterior plaster).

I’m particularly unsure about what to use for the interior plaster. Would a base coat with a higher µ-value be a better choice? Usually, the vapor resistance should decrease from inside to outside, but here it would be the other way round. Or is this not critical due to the mechanical ventilation?
Is the low moisture loss shown in the attachment negligible, or do you have suggestions on how we could improve this?

Thanks in advance!