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According to what I have read 80PSI to 100PSI is the optimal range. It will still stop at 60PSI , though you will be in the danger zone of being able to lock-up the brakes any lower. Hence the warning alarm.

The Master cylinder applies the air-pac, then the air-pac applies the pressure to the wheel cylinders. Actually that is a over simplification but in general that is what happens.

Your right, it makes no difference. The long and short air-pac share the same size air chamber piston,and hydraulic pistons. So the amount of pressure applied will be the same in both systems. The long system will of course have more volume then the short, so you cannot (or should not) use the...

Actually No. The front is controlled by it's own air-pac and the rear axles by there own air-pac. There was a discussion about the feasibility of going to a diagonal system, but the cost of running two separate lines to each axle was a bit too much.