It could be rest timing, too. As mentioned, Blazers are taller so the rest needs all the time it can get to drop out of the way. You should adjust it so it raises up in the last 1 1/2 to 2" of the draw cycle. If it raises too early then it will be last dropping, leading to clearance issues.

Thus, the reasons I don't like things like Blazers. And you should have them fletched in a helical fashion or at least straight-offset about 4 degrees.