I would go for a 110lb shaft with that much weight. I have done what you are going to do and 110 is just right for a 400gr point. I have used both cedar and bamboo with this set up and it works well. If you have a hard time finding shafting in that weight, let me know and I'll sell you some.
I'm intrigued by the Doug Fir that SlowBoinMO mentioned. I have used it in the past and really liked it, but my source went out of business. Good Doug Fir is excellent, but bad Doug Fir is really bad. Just my $.02.