Shrinkage in a gi comes from the way the product is made and the materials they are made from. Some gi go through pretty good manufacturing processes and are effectively 'pre-shrunk; - these tend to be top of the range such as Gameness or Koral. Other top makes such as Atama, Dragao, Adidas, Mizuno etc don't come pre-shrunk. On average regardless of whether a gi is preshrunk or not, you need to take into account a shrinkage of 5% to be on the safe side.
Where a gi is not pre-shrunk, you need to accept that it has the potential to shrink a full size if washed in a hot wash and tumble dried. There are benefits to this as the experienced BJJ fighter can get the gi to fit them absolutely as they require. Its knowing how to wash and dry it, and when to stop.
As far as Keiko Raca, they fall into the catagory of potential shrinkers. They also (from our experience) tend to suffer badly in the tumble dryer. If possible, you should always avoid forced drying a gi in a tumble dryer but some makes, tend to suffer more than others.