The Hiway takes a .335 shaft. We have 3 50g R Kuro Kage Black HBP remaining if you wanted to go with it. I am assuming you are referring to the Kuro Kage Black. The new options closest replacement would be the Kai’li Blue and it comes in a 55g R or a 64g R. The Tensie products are good too and there is not a lot of difference in the CK and the AV. Either one could work as well.
I have no idea what you are referring to with 2HiO or CtP. You should be able to tell what length you have been playing even with it broken. Just measure to see what length you have been playing. Standard playing length would be 41″ on the U21 and 40.5″ on the U23. You would tip trim the U21 as you would for a 7 wood and trim the tip of the U23 as you would for a 9 wood. How much depends on the shaft you choose. After tip trimming, you would install and then trim to your final playing length from the butt end.
Apologies for not understanding your message entirely, but hope this helps.
Britt Lindsey