edit: I tried slanting the coils on this build at a 45degree angle this time, instead of horizantal like last time. Bottom of the coils meet the bottom of the airflow..
I also forgot to mention - I installed the coils on the wrong side, so I have to slightly unscrew the wall so that the airflow slots are in the right place (in front of the coils). This could be causing the slight leak, and the airy vape
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Yeah I'd run the wall screwed down tight to prevent air AND juice leakage. The 3rd hole would probably keep it form being airtight now that you mention it. It's above the O-rings so there's a little room for flow there.
Reposition your coils if possible. Were you able to get your hobo to sit all the way down on top of your IPV3? Mine has a gap.
Post a pic if you can. I have a 28ga 0.5 ohm build on my hobo right now but haven't ran it on the IPV3 as it doesn't sit all the way down. And also I've grown to hate the whistle I get out of the Hobo. I'm used to the MutationX so the Hobo feels almost like a Kayfun these days. One day I'll chamfer the Hobo airholes in hopes the whistle goes away.