there standard gap is fine at 1mm the .8mm is usually for e85 use as its more fuel dense at compression, i was using them at standard gap on e85 upto 14psi boost and they were fine, make sure catch is from crank valley breather to manifold, the rocker cover breather shouldnt draw much thru, its the valley when under decel vacuum that sucks all the oil vapor thru, also im assuming all the plugs were like that or just some ? can also be indication of a valve stem seal issue if its only a single one or few of them