One suggestion, since big bucks tend to hesitate more upon encountering openings such as the lanes you're about to open up. Instead of making the entire lane 20 feet wide, make the actual opening about half that wide, and then feather the edges (e.g. remove half the stems) 5 feet into each side of the lane. The net effect is that you can still see down the 20 foot lane, have a shot down the middle, and the lane doesn't feel as open to the deer walking down it or across it.

I also hunt a few aspen clearcuts and have used this tactic with some success.