Duh!!!
You demonstrated for yourself that your problem goes away when you lift the dust cover, yet your excessive fear of dust and static electricity and feedback induce you to want to change anything else but removing the dust cover during play.With all due respect, don’t you think that is a bit silly?
Not to mention the fact that there is static electricity buildup even with a dust cover down, and the moment you left the dust cover the LP becomes a magnet for dust.
Kudos to you, however, for having the cojones to admit to this human frailty.