Hi rhino!
my explanation was somewhat incomplete regarding "added more modules". I indeed added modules but to another charge controller.
In fact there were two strings:
STRING 1 => 3x 130Wp, each: VOC 22.69V, Vmp 18.49V, Imp 7.03A, Isc 7.48A
plus
STRING 2 => 1x 330WP: VOC 45.17V - Vmp 37.69V...