The Ping JZ lightweight steel is a stiff shaft. I think your plan is a good one and you should see a big difference in the playablity of the Zing2 irons with a more flexible graphite shaft. The Zing 2 take a taper tip shaft (.355), so we need to look at those options. I don’t know what your definition of a low price is, but taper tip low priced graphite shafts are not in abundance. The least expensive .355 tip graphite iron shaft that we carry is $39.99. That is the Paderson Kinetixx TS-1 iron. The R flex is 78 grams and designed to produce a Mid/High trajectory. UST has a Recoil 80 and a Recoil 65 (80 grams and 65 grams respecively) for $44.99. The 80 is a mid trajectory shaft and the 65 is a Mid/High trajectory shaft. Pricing for both is $44.99. Aerotech makes the SteelFiber in a 70 gram (mid/high trajectory) and an 80 gram which is a mid trajectory. Price on the Aerotechs are $53.00 ea. There are a few others, but that should give you an idea of the pricing you’re looking at. It is possible, with a experienced club builder, to bore out the hosels to .370. If you do that, the options open up tremendously and there are good options as low priced as $19.99. We can bore out heads if that is something you want to consider. We charge $9.95 per head to bore out to a .370.