Ok, so I forgot to chime in on the slingshotting effect that you experience, but ruminate over this: When we're squatting, no matter what equipment we're in, we're hunting for tension. Think "Loading the suit" or "Riding the wraps".
When you're not in a suit or wraps, you're loading the tension in your hips and hamstrings (or I am, anyway). When I squat without my wraps, I widen up some and sit back more, and that gets me all the tension I need, usually a little above parallel. As mobile as you are, you have to get VERY wide and sit very far back, and you hit that "bottom" of your hips and hams ROM well below parallel.
I could feel in my warmups this past weekend how the extra mobility work left me looser in the hole. I needed to do it to ensure I hit depth with good position on the day, but it was kind of scary to be warming up and not feel the tightness I'm accustomed to.
We know you know how to find the tension when it's time to PR, so I think keeping your stance in a little closer to protect the hips will be good for hip health and for getting you "muscling up" these offseason weights. Then when it's comp time and you're back out wide, you'll be able to maximize tightness and use it to your advantage.
A lot of times, I think PRs come more from learning how to get tighter and gain leverage, rather than from new muscular strength. You're going to be able to attack both with the way you're setting up now.