Originally Posted by TimothyO
I think it has to do with two factors: frame stiffness and string pattern.
The PSGT is a little stiffer than the 4D 200 Tour. So a string comfortable in the 200 Tour might not be as comfortable in the stiffer PSGT.
The 4D 200's dense string bed means less flex in the string bed which means a stiffer string will feel more harsh compared to how it feels in an open string bed.
It's definitely not binary and instead you have many different factors which influence one another in subtle and dynamic ways that can even change over time.
True, this constant experimentation with strings (and previously rackets) can be both fun and frustrating. When I was demoing rackets, my game really went downhill.