First, with all due respect to the fitter, a cg can not be “around the perimeter”. The actual vertical, horizontal and rearward cg’s intersect somewhere inside the clubhead to give a specific point that is the actual cg of the mass. You can have mass distributed more around the perimeter of a design that can help stabilize the head at impact, but all irons have a specific location. If correctly designed, those that are touted as perimeter weighted will have a longer horizontal cg location (what we call the C-Dimension) and that can improve stability, playability and forgiveness, but only if combined with a well positioned vertical and rearward cg location. Most well designed irons will have the actual vertical and horizontal cg positioned in the center or slightly toe side of the actual center of the face and as low as possible vertically. Those factors and having the rearward well positioned as far back as possible for the specific design, are what make a design stable, forgiving and as playable as they can be for the category of iron they are in. The last ZX5 I measured for our database was in 2021 and the data is at the first link below:
https://store-k9nvqai7wz.mybigcommerce.com/content/PDFs/Head_MPFs/MPF_SRIXON.pdf
The TS4 data is at the following link, so you can compare the cg locations:
https://store-k9nvqai7wz.mybigcommerce.com/content/PDFs/Head_MPFs/MPF_MALTBY.pdf
Again, the mass and dimensional characteristics of any design determine their overall stability and playability. We design all of our irons to optimize the cg location for the design. The TS4 is as stable as any blade design we have ever done. I thin it, or the TS3, or the TS1-IM, or the TE+ irons are all worth a look. For max forgiveness, the KE4 MAX iron would be the choice. Take a look at the MPF database. I think it will be helpful.
Britt Lindsey