Well your situation is kind of complicated. You said you do not wish to go up a weight class, so the need for bodybuilding style hypertrophy training isn't really a productive option. If you're calling it "off-season" training and also not trying to gain weight, and also not wanting to lift heavy for concern with injury, then this narrows your options down: just start gradually re-introducing volume over the course of the first 2-4 weeks and then begin on another sheiko training split with the lighter percents. Without mass as a priority, technique needs to be, so the sheiko style of high volume/high frequency allows for that and really only works for the long haul IF you prioritize that. In fact, I believe that technique will limit you no matter what approach to training you take, so that should be the main focus. The other important focus for you is to build up to an even higher total volume than your last training cycle so you can continue to achieve better peaks. Those are your too biggest tools: continually improving technique and steadily handling more and more volume from one training cycle to the next.
However, if you ever decide to try to gain weight and muscle you'll have a lot higher likelihood of gaining a lot of strength as well. Just don't compromise technique.