'bout the only other reason I could think for a bike throwing a chain other than chain tension is that on a conversion if your chainline is off enough, or your cranks/ring can flex enough, or you have a chainring with shifting platforms, you could theoretically 'shift off ' under very high load.

But I've run 3/32" chains and know a fair few folks who do it and no-one has ever thrown a chain. Maybe your hub is slipping in the dropouts?