Sounds like you are working hard and seeing results. If all your reps are controlled and in perfect form I would up the weight. I say if on your third set you can not get at least 12 reps then you added too much weight. As for your height/weight 150 isnt too bad for that height. Now just keep in mind weight is just a #…for most what you look like should be your main goal. Keep in mind muscle weighs more than fat so to people the same height and weight may look totally different. I use my weight for short term gaols and to keep myself in check, but in the end it is just a #.