Sebass67 goodluck on your 500 just fight to get it.
since you tried it this week dont go for it next week if i were u i would try a double of like 490 or so (im not sure were your at) take it from someone who had experience with that.
when i was in 10th grade i was fighting for a 365 bench and i tried it everyweek and never got it. so i decieded to just do some triples and doubles and all of a sudden i got it.
also ive seen it alot in my gym. they would get the weight one week and go for it again the next week and not get.