Professional bike fitting before starting your saddle investment journey is spot on. Here are some things that work for me and that you might try before sinking lots of $s. Adjust saddle height (lowering a mm or two makes a big difference in reducing rocking), adjust saddle fore/aft (moving forward a bit helps sit bones stay in wider part of saddle), adjust saddle tilt (I like mine level). On cushioning (from chamois and/or saddle), I find less is better on long rides (less "squishing" and related rubbing). Bibs pulled up and that are fairly tight around sit bones help (less movement). I also stand up every 15 mins or so (for blood flow) and also pull the chamois slightly away from sit bone area skin every hr or so (chamois gets "stuck" a bit for me and occasional readjustment helps). When riding multiple days in hot/humid weather, I use a small bit of vaseline in sit bone area - keeps chamois from sticking in place).