I don’t quite understand what you are saying. If you are holding your wrist slightly upwards then surely it is easier to give it more throttle? Your wrist is nearer to the end of its forward motion, which means less throttle? I would also recommend learning the correct technique rather than something you find ‘helps’ you learn. Bad practices learned now will be really hard to get rid of.
As far the smooth roll off when braking, I found it just took a conscious decision to do so. I got told off at the BRC for just grabbing the brake without rolling off the throttle. So I would slowly and deliberately roll off the throttle before squeezing the brake. I concentrated on doing it right before worrying about the stopping distance. Once you are doing it right you can try to do it quicker.