Tony,
You have a good start at being different and much better than the norm in the car industry. I am not saying that you should do away with the Rotation system. But, you might think about changing it.
If it were true that the Rotation system you are doing now puts too much pressure on your salespeople and your prospects, and reduces profits, how could you change it to make it better?
If your salespeople could spend more of their time with high probability prospects, and less with those who will not buy at a price you want to sell for, what difference would it make in units sold and in total profit? What would you have to change to make it happen?
If many more low probability prospects (the ones with a death pact not to buy today) were to come back and buy another time, how could you make that happen?
I probed those questions before I bought an insolvent car agency. It became profitable within a mater of months. Then, we taught our salespeople how to close without any pressure and their average prices were higher than when we did TOs (double closes). Therefore, we stopped doing TOs. Of course, I structured the pricing and commission plan so that we hardly ever took a short profit.
It meant taking some radically different actions including quickly and courteously disqualifying low probability prospects, especially during high traffic times. We rewarded the salespeople for doing that by putting them back in the front of the rotation.
A large percentage of those we disqualified came back and bought a car.
That was a long time ago. I don't know how it would work today.