"seems more probable" is correct and usable in written English.
You can use this phrase when you want to indicate that something is more likely to happen than something else. For example: "It seems more probable that the new law will pass than fail."
That seems more probable than that it's simply because the Palins are Christians, whereas the Portmans, er, aren't.
Somehow, a Philadelphia-Boston championship series (the Continental Congress Series, if not the World Series) seems more probable than a Subway Series.
But with the major phase of Paris's campaign over, there is uncertainty about what comes next: a lasting peace or, as seems more probable, a simmering guerrilla war.
If it sticks, as now seems more probable than not, the fraught period leading up to the agreement will go down as his finest hour.
But what seems more probable is that Mr Bush has already decided to remove Mr Hussein and Mr Blair has already decided to help him.
But with the major phase of the French campaign over, there is uncertainty about what comes next: a lasting peace or, as seems more probable, a simmering guerrilla war.
When he broke him again, a one-sided beating seemed more probable than possible.
It is one of several phenomena which seem more probable in a theistic universe than in a godless universe.
The Barometer is used to draw an ever more accurate map of the future, with the speciality of many different possible futures, the futuribles.2 According to experts, some of these futures seem more probable than others.
FDG-PET/CT showed a slight accumulation of isotope in the esophagus, and while a malignant disease could not be completely ruled out, a diagnosis of esophagitis seemed more probable.
Considering that whenever I make a payment in cash (be it a ten or a hundred) and jest by alerting the cashier that "I just printed that this afternoon," they display a perplexed look upon their face as if I've spoken Portuguese, the latter might seem more probable.
