I'm 5'4 180 I've been working out for almost a year. My one rep max for bench is around 275lbs.My chest is about 40" but my arms won't grow they're about 12" I do standing curls 3 sets of 10 and then a pyramid with dumbell's going from 10,8,6,4,. I just need to know what I'm doing wrong or if i should do more exercise's.