I did notice some lags in 3.2-b2 as well but we've changed the firmware quite a bit to get rid of them. You should be able to confirm this when we've released 3.2-b3.
My fan blows on 3 sides actually. I designed the duct based on the original and it has an opening on the back and on both sides. I need to re-design it to flow more air though as the openings are very small. I'll see if I can get a picture.
EDIT: It was easier to just do a screenshot from fusion360.
You got me thinking about it, and I discovered that you can use it in analog mode. Doing this, I got it to work, but yes, the frame is somewhat flexible, as it is printed out of PETG. Eventually, I am planning to print it out of heat-treated carbon fiber PLA.