First of all you have one thing limiting your efficiency before you start checking different prop pitches. This limit is your rpms, a prop produce its maximum efficiency at tip speeds between .80 - .90 of the speed of sound. Anything over that range and you start dealing with compressibility issues. Once you have calculated your max rpm for your blade then you pitch is the determining factor to maximize thrust. As Bruce stated, a propeller will stall at a certain AOA, just like a wing, when in static conditions. In order to determine this we need to know the Cp factor for the propeller and normally thats not readily availble at a modeler level unless you request specs from the prop manufacturer. A prop will reach a maximum amount of thrust at a certain angle and certain rpm and any increase in pitch angle afterwards will just increase the amount of drag and lower the amount of thrust. Every propeller manufacturer uses a different airfoil combination so the Cp factor will change from each manufacturer. You could perform static tests using a fish scale and your model at different prop pitches. You will noticed that the best static thrust are usually in the 6 to 8 pitch region for the same diameter props.