Why did you use a chain tensioner whild you have horizontal drop outs?
QR and single speed don't always play together nicely, I had major issues with axle slipping with a previous build. Although with properly knurled steel QR faces it should be no issue.
What QR lever are you using? A decent closed cam Shimano QR should be pretty solid. Lightweight open cam designs will slip though.
@vpCogworks started
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Why did you use a chain tensioner whild you have horizontal drop outs?