Binary cams should have equal tiller from top to bottom, at least to start. I'm personally not a big believer in tiller tuning. That's not to say it can't help, but I just don't feel that a target bow needs to be tuned that well to shoot a consistant group, and I can't shoot well enough to see it if it did (and I shoot fairly well).

What changed between then and now : increase in release shooters as compared to finger shooters, newer bows shooting with the arrow closer to the center of the string instead of above center like you'll notice your old Bear is, advent of cams over wheels, and fiber cables over steel cables (cables can now be twisted to adjust cam timing); take your pick. I always start tuning a bow with even tiller.