Well, what I figured playing a while ago was that, every time I had to go get a hotdog for vitality, I was wasting a week. And furthermore, it would only last 3-4 weeks. So what I began doing is going to the shop and either getting a Recovery Necklace, and/or filling my inventory with candy. This would last me either the whole game, or 11 actions, depending on if I got the necklace. I'd S/L every practice (except Franks, Sittch's, Jaw's first event, and Isabella's arc, which, dating aside, are the arcs I do), until I get a good result. Another thing I do that I don't see often is force Jaw to show up really early with the Surprise Bag. I'll keep redoing Sittch's second event (Sittch in the tree) until Jaw shows up afterwards (it's quick, and there's the chance of Gd. Sense, which helps with Control/Stamina/Power).

So, I bet that these might be common (and, honestly, they probably are), but I didn't see them on the forum. These are things I figured out on my own.