I've been forced to take off from lifting for about 6-months, but my numbers were similar to you. 225/325/405x3 @ 165-170lbs.
Rep PR's helped me tremendously. Something like 5/3/1 ran 3x a week, I'd probably alternate Bench, Squat, Deadlift with Bench, Squat, OHP week to week (DL is fine doing heavy once every 2 weeks, OHP is less important if you're focused on the powerlifts).
The template Simplest Strength which has you also progressing on accessory lifts (incline, close grip bench, SLDL, front squat) would be a great fit. That way you're still doing some sort of vertical-ish press/hip hinge fairly heavy every week.