Good candidate for racquet extension ?

oldcity

Rookie
What would make a good candidate for, say , a 3/8 -1/2 extension? It seems like a heavy swing weight is probably out. i've been waffling around lately, trying all sorts of different sticks and haven't found the one.i was wondering about a pro staff 6.1 95. not a hugely popular racquet because of the lowish power but had a great feel and i played decent with it, and served well. lots of racquet head speed. would a flexible, low swing weight stick like that be good one to test drive? my goal with this would be to get a little more lever out of serves and groundies, have a longer grip for two handed backhand. all frames seem kind of short for my two handed backhand for some reason.
 
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