Tom.... I think you are right about the ogive being the problem. Without having both bullets side by side for a visual comparison, I'm only surmising this to be the problem, but I feel you are correct. A Hornady Comparator will go a long way to correcting your problems here. As far as depth off the lands, closer does not always mean better accuracy. One of the guns I'm currently working up loads for shot reasonably well (1/2") at 100 yds. at .020 off the lands. I kept increasing bullet length by .005" until I was .oo5" off the lands. The groups opened up considerably. All the same powder charge, type, and same bullet. I'm gonna try backing away from .020" in .005" incs. and see if that helps.
Hope this helps a little.....We all know guns are individuals, and not all like to be "fed" the same way... Don.