If you're below 67% Acceptance, it isn't because Dispatch has constantly hit you with wrong refusals, it's because you're turning down too many loads. The Acceptance Rate thing is not a mystery, it's easy to figure out, and you know what the rules are. The Rate is calculated using all of the days of the current month, plus all of the days of the previous calendar month. Knowing that, then you should be able to intelligently decide whether or not to accept a load.
Keep in mind that on the first day of the month, then you're dealing with all of the days in the current month, which is one, and all of the days of the previous month, so if last month you had 12 load offers and turned down 6 of them, and were showing an 80% acceptance just before the first, then you're screwed when the first of the month rolls around and the loads from 2 months ago drop off the back end. Now you're at 50% acceptance, and you're in a deep hole for at least the rest of the month. Take whatever scraps you can get in the meantime.
Forced dispatch? No, not really. You aren't punished for turning down a load, but you are punished for being a cherry picker and turning down more than 33% of the loads offered to you. Yes, it could be that all of the loads you are offered just happen to be crap after crap after crap, but that's not likely. What's more likely is that you are sitting back and waiting for the primo loads and are turning everything else down.