LBIA
I think you have made an error with the weekend AMS schedules. According to the Jet2 website Saturday has services departing MAN at 08:15 and 17:15 and on Sunday only 1 service at 17:15.
Your own list already has two LS945/6 flights on Saturday. The 06:40 departure is Monday to Friday only. So it's down to two flights per day except Sunday.
From tha data I have seen the loads have been higher than MAN-EDI or MAN-LGW for Jet2 but lower than LBA-AMS. The middle flight was probably the weak point and has been dropped accordingly. Anyone for a spare pair of AMS slots?
PTH