Properly setting the air-to-water heat pump with underfloor heating

Hey, a little interim report again...

The rooms have cooled down a bit by now, the heat pump hasn't run at night since I set the curve to 0.2.
In the morning at 5 degrees outside temperature, it was between 21.4 and 21.9 degrees in the upper floor with 60-62% humidity, and between 21.0 and 21.6 degrees in the ground floor with 55% humidity.
By noon (9 degrees outside), the temperature dropped further, about 21-21.2 degrees with 55% humidity.

I have now raised the target temperature to 22 degrees to get the bathroom a bit warmer. Then I would also leave the children's rooms a bit higher and slow down the bedroom in the flow.

What I still find strange is that not all flow controllers can be turned up completely and each control shows something between 1.5 and 2.0.

Does anyone have any idea why the towel radiator has no flow? It hasn't warmed up since yesterday either, I hope it could warm the bathroom a bit more without having to raise the entire target temperature in the house.

The power consumption or running time of the heat pump has drastically decreased, see picture.

Well, the power consumption is down because the place or the supply line was overheating, plus rather mild weather. Watch it for two weeks, it will increase again.

Yes, but that is already the first step. Before that, it was going full loud all the time and always just on and off and on and off!

My temperatures remain relatively constant. They are now between 21.1 and 21.5 degrees.

But since I actually set 22 degrees, I should shift the heating curve upwards in parallel, right?

I received the calculation from my heating engineer and have an appointment for hydraulic balancing in mid-January.

Should I try to optimize the flow in advance? For example, slightly less in the bedroom or something similar

So, a little interim report...

The bathroom unfortunately never reaches 22 degrees. The radiator works now too, it was shut off at the manifold.
Can something be adjusted on this large valve (see picture)? I just can't get enough flow, no matter how far I open it, it stays at 1.5.

Everything is fine on the ground floor so far, but I have now set the flow at the toilet from 2 to 1. Just like that, because all other (larger) heating circuits do not go above 1.5-1.7!

I have now also unscrewed all these ERR boxes, they were very warm. Or do I have to disconnect them electrically?

Is that a bypass valve? Are the ERRs on their own fuse? Then just remove the fuse, saves electricity. If not, when dismantling ERR, you can set the room controllers to the lowest level, then they close and also consume no power, they should then cool down.