I have to laugh when we are talking about right and wrong. As long as a finger, any finger, is available to push each valve button when called for, I think your doing ok. For what its worth, my right thumb tip touches the first valve casing dead center just under the lead pipe. That gets my fingers in line with the valve tops, with enough arch to push straight down. That works for my man-hands. Whats comfortable for you? Try a few varriations and deside to use one. Change things up after a while. The comfortable, useable right way will find you! My right pinky goes in the hook, but as far as supporting the horn, the left hand would be up to no-good if it had nothing to do. For quick page turns I simply apply my stand partner. I learned long ago not to try anything funky when putting in or pulling a mute, I value my horns too much to scratch or dent them with a mute or stand....If need be, I drop out and do it right. Luckily it is rare that a composer requires impossible mute changes. Consider yourself lucky that you have (freakishly) small hands that you didnt take up the barisax or string base or such that requires long reaches to get the notes needed. Best wishes.