Protein2o is VERY tasty and doesn't have any odd texture issues.
Isopure Zero Carb RTD are good, but the taste can take a bit to get used to, and it does have a texture with how much protein is in it.
Try different shakes, they are NOT all made equally!
Also if you find that you are having issues with them intentionally, check to ensure the protein is using an Isolate and not Concentrate. Nothing wrong with Concentrates over Isolates, just if you have lactose issues, concentrates have high levels of lactose where Isolates have little to none and typically are safe for even lactose intolerant folks to use.