I am in the T250 but very familiar with the T350. I came from previous generation T300. The current T350 has a slightly narrower sole than the last T300 and quite a bit narrower than T400. You should be able to curve the ball a bit more than with the T400. I’m guessing you went with the same shaft? A fitting might have given you even better results if it showed you needed a different shaft or lie angle. Best wishes. Hope they work great for you.

Because the 400s have stronger lofts (7 iron = 26* compared to 30* I think) you will see some distance loss per numerical iron, but should get higher ball flight. I have not played the newer version of the 350s, but I had the prior version and the look was cleaner and smaller than the 400s.