I have hit both the TE Forged and the KE4 Tour+ irons. IMO both were great designs, just not quite optimized for my swing. Both have a very sharp leading edge and when I get into bad habits, I’m somewhat of a steep digger. I also found the feel of the KE4 to be a bit harsh but still solid.
Both clubs were just wrong for the conditions I play in, and my current swing. So that is something you’ll have to consider.
That being said, I wouldn’t be too quick to rule out the STi2. IMO, it looks nothing like the Ping G2. There is minimal progressive offset and the top line falls into what I would describe as medium. It’s certainly not a club that I would describe as overly large or “Fred Flintstone” looking as far as chunkiness. It’s a very solid club. As far as forgiveness and feel go, I would place it right dab in the middle of both the TE Forged and KE4 Tour+. It also has a cambered sole/leading edge which might be my favorite thing about it. Fit me, it glides fairly freely thru the turf.
If you’re coming from those Pings. They have quite a bit of meat on the top line and a fair amount of offset. The TE Forged has minimal constant offset. And the KE4 Tour+ has significantly less offset when compared to the Pings. It might be a bigger transition to one of those clubs than it would be to go with the STi2, which has slightly more offset in the longer clubs.
Additionally, I found the quality of the TT Score LT shafts to be excellent.