Just did conversion
#4 to short cranks. All for friends. In each case warned that it was pure guesswork. Three of four had very short test rides on a non-ideal test bike. Each rider is completely amazed at how well 150 or 152 cranks work. For them. Promising it will work for you would be silly. But if you are curious or have any reason to think you are a good candidate for shorter cranks it is worth a try.