Another brake to consider is the IBI tactical gill brake. I installed one on my buddies rifle and it compares very favourable to the Heathen. Its 2/3 the price of the Heathen as well.
Is the first baffle going to be 90 deg to the bore, or still angled back to the shooter?
I had one on my 6.5CM PRS gun, was not a big fan of the concussion being redirected back towards me. I swapped it for a Insite Heathen and am much happier for it.
We actually did do that, although not for this video. We found the four-port to be the most efficient in most combinations which is why we went the four-port route for the comp brake coming out.
The video we did about this was a super-compressed version of the testing we did and in reality only one very small portion of it as well.
EDIT: Full disclosure, I work for MDT, and I love my Elite brakes, they can be a bit concussive in enclosed spaces, but they are incredibly effective.