Showing higher grades

So, just out of curiosity, how does everyone go about showing national and international grade horses? Using the method of showing horses right before they're about to go up a grade. Those higher grade horses need 200 stat points to jump a grade and then it goes up from there. That's a lot of points to accumulate only to show a couple shows before the next grade. So what is a good method for showing higher grade horses?

Sometimes I show them everyday and sometimes I wait until they are maybe 50-70 away from level up. Honestly there just isn't as much competition at those levels so my horses still place a lot of the time even when they are at the lower end.

Showing every day helps fill shows so everyone can get more stats! But I show everything anyway so I'm probably not the best model for anyone doing more involved methods.

I also show every day, for the reasons above; less competition, helps fill shows, etc.