You are absolutely right, that the fewer pump cycles, the longer the pump life. You would get a little more drawdown time by setting the pressure down some and adjusting the tanks, but I wouldn't change a thing. It sounds like the system is working well, and as long as the bladders don't fail, your pump should be fine for a long time to come. I've seen plenty of pumps last 20 years or more....hopefully yours will too. You should check the system periodically to make sure it is not short cycling, as that will cause pump failure.