The problem is the British know how that highly superior radar technology works. They invented it. They knew how to detect and exploit it.
The Japanese didn't have radar for most of the war. Speed was only an advantage on the surface when the enemy wasn't tracking your every move on their radar. German boats dived far deeper than American subs and still the British hounded them mercilessly.
Plus, the Japanese didn't have hedgehogs. Those things are nasty.