Your
oil level is really determined by the pan manufacturer, ie: 7 quart pan, 8 quart pan etc.
In a wet sump engine, the further away the
oil is the better, although it is a fine line if the
oil pump can't self prime or stay primed.
If have now made your own oil level, the crank will have more oil on it than normal and being flung around a lot more.
Combined with more oil pressure and probably more oil flow from the rod bearings ends up as a harder job for the rings to control.
How much work was done to ensure adequate drainback from the heads?
Are you sure you didn't break any rings on assembly?