Can the Score LT iron shaft be used as an “A” / Senior flex? Looking at the IR6 and IR11 tip trims and 1.5″ between Reg and Stiff. My theory is that you could do “0” tip trim with a 5 iron and achieve a Senior flex. Customer wants to use steel shafts even though he is 70 years old. Set would be the M890 irons so starting with 6 iron at “0” would even be slightly softer. Any thoughts?