My bag makeup will be driver, KE Tour TC 5W,  4 or 5 HYB, and KE4 Max 5-GW.

I was planning on the KE4 TC 4 hybrid, it’s out of stock. What am I gaining//losing with the KE4 TC Pro IST? Of the hybrids in stock which would be the best substitute for the TC4? Maybe drop to a 5 TC hybrid? Maybe the STh2?

Open to suggestions.