Hi TonyRS,
thanks for pointing this out. In the past, the behavior was exactly like you described. On "Ready for contact" the tanker reduced the bank angle and speed. But, the tanker kept a constant altitude, bank angle and speed.
What Iḿ experiencing now is that the tanker is not only slightly changing the bank angle but even changing turn direction. So for a short period, we are in a right hand turn, coming back to a left hand turn right after. And this is not only happening once, the tanker keeps doing that. It's probably this left-right-left turn change, which is causing an altitude drop. which makes it hard to stay inside the basket. And the tanker even does this, when you drop out of the basket and back-off to re-approach. So it's not a proximity thing.
All others: Thanks for trying to help. But when something seems to be a problem, I don´t like to move to a workaround like race-track. It's better to report and get feedback on the actual problem. The hint with the track is pretty helpful, I will post that as soon as I have time.