hi sloejp

being a lighter racket it is probably to do with a smaller grip, especially if your old racket had the grip larger than when new.

new rackets tend to have very small grips, usually too small for most males. so you tend to try to grip it extra tight so that it does not slip.

look at the library, here -at the top there is info and pics about grip size.

it my also be exacerbated by poor technique - your wrist should be pretty stable during the swing - using your wrist to generate power is a sure way to damage it.

let us know more details if this answer does not strike a chord

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