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Foam said..
Yep, understand that, but from what your saying 8 is a bit long regardless if it's the starting point
Ok well if you are determined to risk cutting it too short for you, then by all means go ahead.
Otherwise, do what everyone else does and eg. start at 9" overhead, try it, and then if it's too long cut it down an inch, try it again, and if it's too long cut another inch off etc and keep going until it feels right.
Many people have their paddle 8" overhead (or longer). A friend of mine cut his kialoa at 9" overhead regrets not having it longer.
But some people have paddles that are their height or even smaller.
I'll say it one more time only: no-one can tell you exactly what is right for you. You just have to experiment for yourself. The Quickblade charts are a useful guide but that's all. It's your responsibility to choose the right length for you.
Why not borrow an adjustable paddle and find out what is right for you?