Dawson Foundation repair for drilled concrete piers - More expensive but better results in my opinion. Jericho for pressed piles.
Or do what the other guy says and move to Austin/San Antonio. It's not like 90% or the homes built there in the last 50 years are slab on grade and pretty much everything East of 35 is built on clay too. Nobody in either of those cities has ever needed foundation repair lol!