My advise to you would be, Don't set your goals too high. Be satisified with a bull, any legal bull. The success rates are low for archery hunters, so don't get hung up on size of antlers. By expecting too much, you'll be setting yourself up for disappointment.
If your brother is coming with you and has hunted those areas, then you know he has knowledge of those areas and where to look to find elk. That's a pretty good starting point.