G28 Fine, then G29 ABL Probe hits bed

[cperiod]

Your offset is 15? The default value to lift before extending the probe (edit: Z_RAISE_BEFORE_PROBING) is 10. After the G28 it knows where Z0 is, so it's probably going to be as low as possible before deploying the probe. Try changing that to 18 or so. But I'd definitely look at a shorter probe; the z axis is slow, and that extra offset sucks a lot of time.