I am currently playing the discontinued KE4 TC U21* with Kuro Kage shaft and love it! Great for tee shots on short par 4s as well as fairways. Thinking of getting a hybrid to replace my 5 iron for more height. It looks like the KE4 TC Pro IST is more similar to the TC U than the Tour TC is. Which should play more closely to the U? Also, should the MPF Pro shaft play similarly to the Kuro Kage? I have played exclusively Maltby products for over ten years and have never been disappointed. I just made a new set of the STi2 second generation irons with MPF Pro shafts and love them too! Great work as always.
I have the Pro IST Tour 4 hybrid with a stiff Rapport Core Blue shaft and love it. I also have trouble some times getting the ball flight higher and will say the 4 does a good job. Good luck.