I understand what you mean, I've been trying to put into words the difference between some multiple crosses (polyhybrid?) I've tried, and Mr Nice strains, and clean is the best word I can come up with.
As far as today's demand for really stony stuff goes, I'm under the impression that if one searches hard enough, one should be able to find something comparable to today's strong polyhybrids, or is that not possible with the basics? For example, Ortegas special notes say " Once you find a keeper in this strain it will act as a bread and butter strain for you and fellow users" and Nevils description of NL5xhaze "A Note of Warning. Adverse effects have been known to occur among inexperienced smokers, particularly when combined with alcohol. Side effects may include nausea, dizzyness, fainting, and loss of bowel and bladder control. Extreme introspective behavior is considered normal." You'd think the latest generation would be all over that, or are they smoking even stronger stuff?