Your choice of Sept 30th is a fine choice. It's a good compromise of decent length days up there and hopefully less wet weather than you will see a little later during the rut. As you stated that you haven't shot any big game yet, I think you couldn't have picked a better spot to learn the ropes. The deer are very manageable in size, so take advantage of it and skin and quarter the animals before putting them in your coolers (start collecting plastic milk jugs now to freeze). Please remember to keep evidence of sex on your animals so you don't ruin your trip with legal issues. Your 30-06 is fine, and there is no need for expensive shells. Just get a few extras to practice your shooting because you want them to drop quickly....that bush is really thick and it's super easy to lose a wounded animal. There is a good gravel pit outside of Masset to shoot at or a really nice little shooting range in Port Clements to site in. Don't fixate on getting the biggest bucks out there. Does open Sept and they make awesome table fare. In my opinion, it's probably more important to go through all the steps of finding an animal, stalking, shooting, finding, field dressing and finally quartering the animal than collecting a little set of antlers. You will have 5 tags each so you can get a lot experience in a short time if you try. When I do drive back to the lowermainland with fish or deer I try to take a night ferry back, get a room on board and then I drive it in one shot (about 17 hours). Audio books make the trip much better. If you see a blue GMC 4x4 give a wave and I can maybe point you in the right direction and give you a quick butchering tutorial. We have a house that we occasionally rent out to fisherman and hunters up there but I will be up there at the same time using it doing the same thing as you.
https://www.airbnb.ca/rooms/16111927...s=0&s=RmUXo-5u