I did the same with mine (re treats and handling, or at least I tried!) when they were little (about 12 weeks old now, practically grown), and after a few days there were three camps: a group of three or four that were very sweet and friendly, some of them even eating out of my hand and wanting to be picked up or to sit on my shoulder; a second group that pretty much fled in panic, with zero interest even in mealworms; and the majority, that came fairly close to snatch treats and run, but didn't want to be handled.
The "friendly" ones now all seem to be cockerels, one is definitely all roo, tail plumage and crow and all! The panicky ones are the brown leghorns and they are calming down a LITTLE. The remainder are still about the same. They are all EEs except for the BLs. Sometimes the BLs cause the EE pullets to panic until they realize it's only me, lol.
I think they are all a little goofy, but the feeling is probably mutual, so it's all good.
ETA: There are 4 or 5 BLs. They won't hold still long enough to count, lol.