I agree with the larger bear being more likely to attack. I recall reading a study a few years back, 'bout elk calf & deer fawn mortality I believe, and it was saying how when fully mature (around 6 yr old) black bear boars became much more predatory in nature, rather than just opportunistic feeders. When I lived on a ranch, a few years back, that had sheep, most times when a bear took to killing ewes regularly it turned out to be a large boar.
We can't bait here so a couple seasons back I decided to get serious about calling. This time of year a call that'll mimic a cub's bawl and in fall a coarse jackrabbit/fawn distress type sound. Lot of fun sitting there squalling like some kind of bear happy meal. First one I called in ('10 season ) was a nice bear, fun hunt. Shot at 18 yds, hide squared out a little over 6 & 1/2 feet, FWP aged him at 12 yrs. .338 with a 225 gr Nosler Partion, never had anything I shot with it argue and it's a comforting thing to be carrying when doing that kind of thing.
For the most part here though if they get a whiff of you they're gone, especially ones that have been around awhile, but like anything else there can always be an exception.