Dear Step,
In the case of the smooth touchdown…you will almost always hydroplane and all that runway behind you is now useless…and there will be too much of it behind you and not enough in front. Someone used the term "Boink it on" and this is what gets your tires through the standing water…so your brakes and wheels, and any other lift dumping devices can do the job you want them to. A higher than normal Vref speed coupled with an additive above that incorrect speed and standing water makes it a natural that they will have stopping problems. An old friend and TRE always used to say.."Theres' always a reason…"