Yes, I had full stats Spin is huge. Boost is your best friend in a race, so being able to gather it faster will serve you well. Tricks is also important as it makes your ubertricks faster... which means more chance of getting Super Uber to get ahead. Finally, if you already have the racing stuff, then leave stability alone and go for at least 5.0 on toughness (means you don't have to charge up for KOs), until you can afford to get the maximum on those two as well.
there's a specific sound that plays when you land an ubertrick that kinda sounds like clicking. usually the 'thud' landing sounds come from intense landing angles or speeds if that's not what you mean, could you clarify what you mean by clicks and thuds?
@witty boy slim usually if you get a thud you'll slow down just because you don't have enough forward momentum... the kinds of sounds you get will vary depending on what you're landing on, whether it's ice, powder, or groomed snow (there's also rocks, but that's rare). a good indicator to look out for is the animation your rider does upon landing. good landings will look like a basic landing, while bad landings will look awkward