I agree with Terry re arrow diameter. Should be able to get 11/32 shafts plenty heavy and spined heavy enough for what you want. Also no need to leave them longer than necessary for extra weight. Can just go with a heavier point, on a somewhat shorter shaft, which will give you more FOC as well.
Given your draw length, you'll almost need a full length shaft. I believe Surewood Doug fir shafts are 32 inches long. The point taper will be an inch, leaving you 31 inches BOP. That's 1 1/2 inches beyond the back of the bow at a 29 1/2-inch draw length, which is a pretty good length.
I'll assume that by heavier broad head, you're thinking about something in the 175-200 grain range.
If you're drawing 29 1/2 inches, you're probably pulling about 62# with that bow. It's a relatively high performance bow and likely has a low stretch string on it. Given all these factors, you'll likely need a 11/32 shaft in the 80-85# range.
Would be a good idea for you to decide the arrow weight you want including the point you want to use, before you order your shafts. Supply that info to Surewood, and they'll determine the weight and spines shafts you need. Good luck.