The 10:1 harken block that came with my Infusion had a double block attached to the becket above the cam cleat right out of the bag, and that is how a ran the line with the top block 90 degrees to the bottom. Seemed like it would work good sitting on the couch. I soon found that the double attached to the cam cleat becket didn't pull on the top block evenly causing it to twist and the lines to override.

Fortunately, the boat Mischa raced at NAF18 last year no belongs to someone in the same club. So with that as a model, the double block is attached to the top becket of the lower blocks, not the cam cleat becket. The line is dead ended to a becket on the double. Surprisingly there is plenty of room in there. That my story.