? for all the powerlifting bros

Guys, how do you train for a meet when your "on" as opposed to when your just training on the "off season" is that even a phrase in PL?? I train 4 x's a week Mon-squats & assistance, Wed-chest & assistance, Fri-Back & assistance Sun-shoulders or arms (whatever I'm feeling that day) Always heavy & always intense. I want to get into a meet around the summer, my lifts are good, but not impressive enough to win an overall. Bench is 325, squat is 405, Deads 425, I'm 5'11" 230lbs 12% bf. Any advise?? Also does fina help with the strength increase like halo?