Some plus size riders I personally know are simply excellent (very quiet seat and soft hands). I do remember being very impressed with one bigger lady at the clinic, who had a long break in riding, but had such a deep/quiet seat I could just dream about.
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."