I cut 2 of my air slots today wider/deeper, helped it quite a bit. I have been used to higher watts while vaping, and I got the Boge Rev to be a more portable solution with no extra bottles/batts/stuff to carry. I was thinking it's less vapor was due to the 3.7-ish voltage. I took the (included) carto off, and put it on a Darwin to measure the resistance, it hit quite a bit better. I could move Darwin down to 3.7 volts, and it still hit better than when it was on the Boge Rev.
I have a Dremel, but wanted to be a little more slow and controlled. I used a hacksaw. It's blade is also thicker than the original slots. I used it gently on the "pull direction" only. The Boge collar is plastic, so it's easy to cut. I just cut the two opposing slots a bit, it made quite a difference. I will use it like this awhile and see.
It's a little uglier, but this is my "working outside" vape, so I don't care.