Thermostat failure Mr. Gasket High Flow

I have had 2 Mr. Gaskets fail to close to heat up engine. The first one the opening part was cocked in the sleeve and remained open. The new 1 is probably same problem cause engine doesn't heat up. Of coarse there made in China. The old ones weren't a problem it's the new Chinese ****. Now I have to remove the new one and figure out what to replace it with. I have also had problems with the cheap Stant ones.