Harold had a habit of adding lobe on the closing side to give more duration at higher valve lifts
he fretted over a couple of degrees extra say at 200 all on the close side
so he "advanced" the nose measured down .050 on each side that one degreeing the cam would do
worked for him
Jones also uses this "trick" he may have got it from Harold but he designs cams completly differently than Harold's
of course most trace back to Ed Winfield (IDK about Crane who came out of nowhere and really shook up the good old boy'sclub of camgrinders in so cal)
Another real possibility was that the advance was required to fit the grind on the core
one reason that Comp likes 110 degrees LCA