Yeah idol stats don't really matter. Just make sure you equip the best accessories and all that for your respective stat, and even training won't matter! lol (nor will getting hearts! I usually only get like 1 or 2 hearts soometimes 3 and then just grind money)
hmm.. I actually don't remember how to get super break. I'd have to look it up or put the game again, I haven't done a playthrough in a long while. (I usually just do s4u now... I should do a new playthrough since I haven't gotten all trophies and also I haven't bought a few clothes)
Oh btw, are you playing it on a JP account or US account? If you are gonna buy DLC, some DLC is locked unless you have certain trophies, which you of course need to have them in a JP account since you have to buy the DLC through the JP PSN store. I played mine on my US account and got too many trophies until I found this out, and was like "well shit..."