On the other hand, according to QRH I should be able to get M.80 with 1.85 EPR at gross weight of 130000, FL350 and SAT at least -54C, but in fact I need 2.19 EPR with SAT -58C.  Obviously there's huge possibility that it's me doing something wrong, because I'm not very experienced with this kind of aircrafts, so if anyone can provide some detailed explanation I would be very thankful.

Regards,
Grzegorz