Just thought of another thing Don. When you practise what I suggest above, keep your arms and wrists parallel to keyboard (almost the same position as you would use to type).....the up and downward motion of playing the octave scales should be a relaxed up and down movement of the hand while the wrist angle remains somewhat constant.....in the same manner as when you wave to someone.

You should have a lower overall ''arc'' of where your fingers are stiking the keys than say the position/angle your fingerpicking hand would pick guitar strings. Same applies to the right hand position. All finger movement should be generated by the fingers, with a slight rocking motion eminating from the wrists.

This way you will build up muscles and your hands won't get tired too quickly. Keys are quite effortless to play compared to picking acoustic instruments. Enjoy and have fun exploring.