I think the only reason to use the set bonuses is to reach ms faster which is redundant because of instant ms. If you use it to push then insta teapot though i agree some bonuses actually speed up pushing and not increase power (AG, Pirate set, etc), but using all of the set bonuses at the same time is absolutely useless aside from the 1.5 better drops (which i doubt even works).
For the firestone problem i limit prestiges to 5 a day for achievements and equipments then only go ham on tournaments. And upgrading stuff over and over is easy because you dont actively play the game and just return every couple of minutes.
For the firestone problem i limit prestiges to 5 a day for achievements and equipments then only go ham on tournaments. And upgrading stuff over and over is easy because you dont actively play the game and just return every couple of minutes.