I'm a bit reluctant with smaller boards. Some years ago I had a CustomX 147. Nice on groomers but hell in powder, and also chattery at high speeds. I then decided to get a longer board: the 157 Liberty Carbon (yes, my whole experience with boards comes down to two models). But this opinion of longer=more stable might be out-dated cause technology improved a lot the last years, I reckon.
The other thing are the stands: I tried a lot of angles and distances and now ride my 157 Liberty Carbon with 15°/5° in the most outer stands. Don’t ask me why… I simply felt most comfortable like that (comfortable=most in charge). But I’m always open to learn