...but now my short-term and long-term values are mostly the same.
That makes sense, but I don't understand this:
...but if the choice was to be made a month in advance I would have chosen studying.
Could you clarify that? I don't understand "if the choice was to be made a month in advance" -- you planned to study in one month's time?
If I was given the ability to force my future self of one month later (or my past self, if that were possible) to study, I would. But at any given time I would usually choose not to study.
This is like a study I read about where people were given a choice between a bag of chocolates and a bag of fruit. If they were told they would immediately be given the food, most chose chocolate, but if they were told it would be delivered a few days later, most chose fruit.
For the past few years my willpower has been steadily increasing. If it lasts and I use it to accomplish something noteworthy, I might write a post about it.
Anyway, what should a rational preference utilitarian with infinite willpower do? Assume that there are no negative effects (unhappiness, stress) with using this willpower, and that they can control their emotions at will.
Clearly they should work a lot more, not spend time on recreation (movies, TV, games), stand instead of sitting, etc..
What else? Should they listen to music? Should they keep their muscles flexed 24/7 ? What should they learn, where would they have the most relative advantage? How much time would be worth spending on social interaction?
I can figure out these things on my own, but those questions are important and good ideas are very valuable.