I always do space with the left hand if I happen to use the right I actually make more mistakes as I still hit the space with my left before continuing. I move my hand around to hit the backspace with my right ring finger. I tend to switch shift keys dependant on the key I wanna hit for I I always use the right pinkie for A the left....always.

As for capslock I don't like that button at all I hate it in fact (on this laptop especially it's too big compared to the a key.) I tend to just hold shift with the right pinkie and compensate.