I currently play the 2019 model T300s with the R300 AMT Red shafts and hit them with average results. Age (75) and physical issues (pulmonary, arthritis in lower back, and hips). I have been thinking about going to see my fitter and trying the T400 model and try a few shafts, of course all based on the results from Trackman. I know I will automatically pick up yards based of clubs being 3* stronger than the T300s, per club. Has anyone played the T400s? How do they feel and what is your opinion on the heads? Think I might conside something that will take less effort. One of my buddies went with the new T300s with the graphite shafts and they really look and feel great. Better weight distribution and the bottom seems thinner. =)