Keeps getting to hot

I missed the shroud part. Does it only allow air to be pulled through the radiator? If it does then as others have stated not enough flow. The only other question is how fast is the flow? Could it be too fast and thus not allowing efficient heat transfer? Also I have seen some cooling systems where the fans pushed air through the radiator. But of course that would require a good tight shroud as well. Just thinking there is very little room for the air to flow after the fans. You could be seeing some cavitiation of the fans.