If you can't keep a big bike under control in ALL riding conditions, fast or slow, you are not a decent rider. It's THAT simple.
Hell, just to pass the Big bike license exam in Japan you have to ride a 20cm wide 2cm thick plank, very slowly, for 15 meters in MORE than 10 seconds without falling off. You are required to ride a Figure-8 without touching the line. The average number of attempts to pass the test is 6 attempts. Even the CHP, when they came for a visit, didn't pass the riding test on their first try.
No... if you can't handle your bike, regardless of its size, you are NOT a decent rider. There are many small Japanese women in the motorcycle police corps in Japan. They have no trouble with big bikes, even at traffic lights.