With the new system, it comes with a small metal piece for the top and bottom blocks that hold the blocks pretty much straight in line. Obviously, that would not do if you are off to one side or the other.
So, first thing you do is remove those so both the upper and lower blocks swivel. In doing so, I have never seen them want to turn away from me.
I do know I want to adjust the Ratchamatic blocks so there is a little more drag on them when the load eases -- tea-bagged myself a couple of times on my first try out with them, but on the other hand my tacks were awesome now that the sheet runs out easily and allows for the leech to ease and let the boat continue through the turn. Haven't made the adjustment yet and guess I won't for a week or so -- heading to Saipan to teach a seminar out there. Hope I don't get that new dreaded flu in the process.
Take care,
Rick