Before, I was using a low end Yonex racket I got at Costco, so it was pre-stringed. The racket had a sticker that said 16-20 on it. I just bought a Apacs 900 with 23 lb string tension after hearing several positive reviews on this site. Is that too big of a jump? Also, what differences will I be noticing with this racket compared to my low end one?