Then you are doing something very wrong. Seriously. Ya, there is going to be variability, even with us using the same club, but yours shouldn't be that bad.
What is your lineup? Are you using RP or CM(auto)?
Are you suffering a lot of injuries? Players tiring a lot? Do you mostly stick to the same starting 11 or rotate?
Started with the CM(auto) but read your posts so i'm using the RP one now.
Balo(Fierro) Trq, Sturridge (Balo/Fierro) TM, Sterling (Markovic) F9.
Coutinho AP, Henderson RP, Gaston Gil Romero BWM
Moreno (Gaya) LWB, Balanta and Sakho, Manquillo (Johnson) RWB
Very normal amount of injuries, but I do rotate a lot so maybe that could be a factor.
Come to think of it I use LFCMarshall's transfer update, do you? I guess that could be a pretty big factor as he also edits player attributes.