The block has been something I've dealt with with a number of Spott Hogg Sights and bow setups over the years when using my large 5 pin head. It's definitely not something unique to the triple stack. Basically it has to do with where your rest centershot is, and correspondingly where the sight needs to be set. Rest further left, sight further left. Rest further right, sight further right. On the single / double pins it's easy because of the bar they use, with the larger housing you need to move left / right with the blocks.
With that said, I'm in the group of a bunch of others, the delays for me mean I can't get it on my hunting bow before the season.