I am going by racquet recommended range: 55-65 for Dunlop, 50-60 for Wilson.
Dunlop is new, so it is first stringing. 1st session feel stiff but it is loosening now.
In WIlson TF X1 felt very stiff at 52 for many weeks. I am stopping to use TF X1. I like ball getting pocketed and cannot wait weeks untill feel is there (when string starts to fry). It takes long because I hit flat, on the rise.
I am opened for suggestions.