My Adams XTD ti 23+26 degree both have Nippon 950GH REG flex iron shafts in them.
I put the extra 3+4 iron shafts I had lying around in them, uncut.
High ball flight with no effort and good and consistent distance as well.
They also don't "fold up" out of the rough, wet or dry.
Pleasant surprise and no desire to change them out after numerous other experiments.
🙂