I can understand what youre saying. If the racket in your hand just felt different or you felt that your hand wasnt relaxed enough with the different overgrip then I guess that can affect your confidence in striking the ball.
Ironically, I have tried lots of different overgrips but have found I always go back to Supergrap. You have obviously just found the overgrip you prefer.
"The older I get....the better I was"