You shuld be fine in the range under 100. I have found a good amount under 100 fora dozen and more under 100 for 6. I think 6 is enough so I'd go with them and get a little better arrow.

I have a Bear instinct with 29" draw and 74 lbs. I'm shooting CX terminators 6075's that I bought a few years ago at walmart but I never used them. When I got this bow I remembered them and got them cut down to the right length. I plan to upgrade to a better CX arrow after I have shot these a while. They weigh in around the 400-425 mark with everything on them. I expect them to have no problem with penetration. I worried a little about that untill I figured out KE for my bow. I should be in the 70s with it. I think you setup should be fine with something like that.

But first get to a pro shop and get setup. Oh and congrats on the new bow!!