Orwo NP 20 in Rodinal

I got a few rolls of Orwo NP20 a few weeks ago.Expired in 1984.
NP20 usually is an ISO 80 Film. So I shot the first roll at ISO 80 und developed it in Rodinal (11Minutes).
The results weren`t satisfying. The film rolled extremly after drying, as you can see below. Because of that the edges turned out way too bright after scanning.

I shot the next roll at ISO 50 and reduced the fixtime from 5 to 3,5Min and it worked much better.

Rodinal 11min, agitate for the first 30Sec constantly, then every min 3inversions.1min stop, then 3,5min fix (with TMAX).