Id definately keep maxing for a while, aslong as its not taking a visible toll on your overall strength. I get alot stronger when I max consistently. Everyone's different though. Id reccomend attempting your max in 5lb jumps, maybe 10lbs if your feeling real powerful. Try going for 300 first, then if you hit that, raise it up accordingly. Even if I feel I have extra strength, often Ill only go up 5lbs on bench, so I dont waste an attempt and fail the weight. Unless Im sure I can get it. Youll hit 315 soon. Just dont try to rush it too much.