Stuttgart has indeed been dropped.
DUS/HAJ are operated as a W-Pattern with a DUS-based aircraft:
DUS 1000 - 1025 GCI 1100 - 1130 JER 1200 - 1445 HAJ 1520 - 1610 GCI 1640 - 1710 JER 1745 - 2005 DUS.
I guess this is the ATR72 by Contactair.
FRA apparently is operated in a W-pattern with the incoming flight not operated on behalf of Wolters:
GCI 0845 - 0915 JER 0950 - 1300 FRA 1335 - 1445 GCI 1515 - 1545 JER
The published timings for MUC make little sense. The MUC arrival currently is at 0930/1055, while departures are at 1730/1850. Unless the aircraft is doing another charter for someone else in the meantime, it would sit idle for six hours on the islands and would have to reposition to GCI in the afternoon.