there do seem to be some cars which have abs that triggers very early, though why they have been developed that way s open to debate, it may be accidental or it may be deliberate, possibly to cover a potential instability in the car if it is subject to higher braking force or as have seen suggested in the past purely so the customers trigger it more often and feel they're getting their money's worth !
what is interesting to me is an article i read had an abs developer ponting out that if a car has it's weight, weight distribution, springs, shocks, wheels or tyre sizes changed from standard, it should really have its abs re progammed for it to work to its best potential. apart from thinking about all the modded cars out there he also pointed out that a lot of companies have just one abs setting for a model, regardless of spec and almost certainly regardless of any optional extras such as alloy wheels