Vezon i'd do the quests ASAP because bosses tend to like to avoid you when you most need them. It'd honestly be easier to just tick off those bosses on the way to 500. Also Endurance is the best way to get to 500 kills. I wouldn't worry about the food problem as almost every boss can be rushed without taking damage, or little damage that SS heals off, granted you use Dclaws and Overloads and Turmoil. And Cow, yes, Climber is the best way to rack up points. Higher floors grant better points and Climber always beats Endurance for points.