[camgrinder]

Looks good John.
The formulas for duration and peak HP numbers need another step, some way to include crank stroke. If you have an engine and change only the stroke, and keep the compression ratio etc the same the powerband will move down. Also when running a higher rod to stroke ratio the point in the intake stroke where the piston reaches maximum velocity is later than a lower rod to stroke ratio. (connecting rod length / crankshaft stroke = Rod to stroke ratio)
The "overlap cycle", or "5th cycle" as Ed Iskenderian terms it is very hard to define. Because you have both ports exposed to the cylinder and the piston moving into the combustion chamber and then away it is very dificult to know what is really happening. The port sizes, combustion chamber shapes, piston dome shape, valve lift during this cycle all have a dramatic effect. A high dome racing piston might block some of the effects of the overlap cycle, while a low dome style piston can give the intake charge a straight shot out the exhaust pipe.

My number one parameter when choosing camshafts is the intake valve closing point. This is the ultimate governor for RPM.
Later closing = higher RPM, early closing = low rpm.
The optimum scenario is to set static compression based on intake valve closing to achieve the desired dynamic compression ratio.

Next is exhaust valve opening. If the exhaust valve is not open enough by bottom dead center the piston will have to push the exhaust gasses out creating a pumping loss.
Early opening = high rpm, later opening = lower rpm.
Notice on your S camshaft valve lift curve, the exhaust valve is open +/- .150". Not very far. Since the pressure in the cylinder is extremely high right after combustion the exhaust flows out, but at high rpm the torque can fall off because of a pumping loss.