I have a Loki inner carbon racket K1 that I bought in February of this year. I have Loki RXTON3Max blue on one side and RXTON1 1mm black on the other. I've used it for about 20 hours. I've shaved down the part where my finger hits. The back side is from another racket, so the bottom right corner is about 1mm short. Would this be suitable for a penhold backhand test setup? Thank you.