It's normal to feel backwash from the front of a fan when the back pressure is significant. I printed a backwash eliminator for the 40mm fan on my Ormerod to eliminate it. In theory, it should increase the cooling efficiency as well. The design is at https://www.thingiverse.com/thing:441099. The OpenScad file is there, so it could be adapted to suit the E3D 30mm fans.
I'm one of those with the wifi issues.
Im sure the wifi is an amazing option, until it doesn't work then its beyond frustrating.
A wired unit lets you connect it to your network with zero issues and if you need wifi, connect it to a tp-link travel router or other similarly inexpensive option.