f you find an overgrip that you love you won’t want to let it go - even if it's not quite the right thickness for you. If that’s the case you may want to double up and wrap it twice. It's not unheard of for professionals to do exactly that.  The drawback is that the more overgrips you use the less in touch you are with the original grip making it harder to feel the bevels so the racket is more likely to twist in your hand.  But as with all of these things it’s down to personal preference.