Hi soulby ... that sounds great to me! Rather than mixed, that's pretty much what I'd call the desired results. Units limited to three instead of maybe five. By asking yourself the question, "Am I done ... now?" you at least open the door a crack for a possible answer of "Yes" - or at least trying that answer out for a little bit.
Being a data-driven kind of guy, I mostly find the numbers a handy hook to hang my hat on

As the saying goes, whatever works. If you find some leverage, three cheers for you!
As many seem to experience, my tolerance is indeed w-a-y down. I stopped at two again last night and this morning I had to pause a moment and reflect on whether I really had or had not! As much I as love red wine, the thought of finishing a bottle right now makes me groan imagining the horror that would surely follow next morning!