Profiles' 145mm crank arms

That doesn't add up and is not what others have experienced. Maybe they just weren't for you?
With reference to the latter part of this statement. You are quite right that maybe the shorter cranks just weren't for me but may work for others.

However, as the OP has a similar issue with knee pain I thought it pertinent to join in this discussion. I am in no way saying that he shouldn't try it, but 145mm is a hell of a drop from the crank length that most people would use and my personal experience would recommend against it.