Not sure how you feel about adding pre-set chemistry, but I just had a feel bad chemistries in my game that are really odd. Shinsuke and Balor have awful chemistry, Owens and Cena have poor chemistry, Ambrose and Reigns have poor chemistry, and Bayley and Sasha have poor chemistry.
I know chemistry is random if it's not pre-set, but these all seem to be good enough to maybe be pre-set.