OK, that helps a bit. Age certainly matters. I'm not sure what off season training is though. Do you just mean not peaking?
I stand by what I said: adding 180 lbs to your total by July is unrealistic, but 50 lbs is definitely possible.
At a guess, your bench technique is nowhere near as good as you think: your squat and DL are quite respectable for your age and weight but your bench is low for your bodyweight. I would focus a lot of energy on getting your bench technique bang on, because that could buy you 10 to 20 lbs right there. Arguably your DL may need work too, or you're just much better suited to squatting and get a lot out of your wraps. Again, all this is a guess though - I haven't seen you lift.
You're probably going to be better off just training to get stronger and more muscular and minimising time spent peaking. You'll get stronger that way and also progress more consistently. Off season and meet prep applies more to people at the sharp end of things as far as I've experienced it.
Pick a proven program and run it exactly as written. Off the top of my head I'd go with Cube, Juggernaut or my personal favourite, 5/3/1. The only issue with 5/3/1 is that sometimes people get confused with all the variations (I don't understand how as the books are very clear), but generally anyone who does it properly gets great results.