[Daggs]

That mesh won't last long, and make sure it's not galvanized!
Are you using the 2" bung that comes in many of our lids? I only use 2, 3/4" inlets. Reason for this is I know what certain lumps max out at temp wise in my drum.
5 inlets is way to much! Ive had problems with magnets personally. Not the best seal and don't hold as well over time.
This is just my opinion but I keep my intake equal to or just less than my exhaust. This prevents stale smoke and keeps my temps from jumping too much.