If you like the TT AMT Red Regular in the Titleist, not reason to think it wouldn’t work in the TS3. If you just wanted to try something else, you might look at the KBS Tour Lite in the R flex. Also a higher trajectory, spin shaft. I usually advise that if you have a shaft that works and you want your new irons to play similar, use the same shaft. If you want to consider graphite, that’s different. Graphite can never feel like steel, but we can try to find one that provide similar ball flight results. Won’t find a similar weight to the steel in a graphite option that provides high ball flight. Would need to go lighter in overall weight.
Britt Lindsey