In my Brian's SZ2s, I installed a nylon professor strap just below the knee cradle (just below where your red behind the knee strap sits). I wear this somewhat tight. Then, loose elastic knee to calf strap, loose elastic calf wrap, loose leather boot strap and loose toe ties. My pads may ride a little low for some but I still land in the center of the knee stacks.
When I get back from LTIR in August 2024 (another total hip), I plan to experiment with a slightly tighter boot strap and switch from loose skate lace toe ties to even looser elastic toe ties. For me, while I cannot bring myself to ditch toe ties altogether, toe tie length and material are now more about ankle-health preservation and less about pad-sit/pad attachment.
How the knee pad strapping, professor strap and knee pad/knee cradle interact is critical to proper rotation and different for everyone depending on personal preference/make and model of all of the above/your anatomy/etc. Trial and error...
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