I have a question regarding my Yonex rackets. Basically how I test my racket frame for flatness is to use my polished granite countertop, and placing just the head and parts on the shaft on the countertop, and the handle suspended in the air. Then I press down the middle of the string bed with one finger. And my other hand, I press down around the head frame kf the racket to see if there is any give. If there is give, then that area might be slightly deformed. I was wondering if this is normal? If it is, does it affect the racket's performance?