"too slow" -- I was actually thinking that it's interesting how some skaters have high jumps but relatively slow rotations (Sebestyen comes to mind); and yes, it's very impressive when they complete the rotations because you can see the jump in its full glory, but sometimes they don't manage. Then there are some skaters like Caroline & Tara who have unremarkable height, but amazingly fast rotations that make you go "Woh, what just happened?" Then you have out-of-this-world jumpers like Mao & Yu-nah, who have both height and angular momentum.
Ultimately, what counts is that they get all the way around clean, which means low but clean jumps get rewarded more than high ones w/ messy landings. Ashley double-footed (?) her 3lutz in the junior world LP, or if she didn't, she pulled her foot out just in time. Mirai also had lots of wobbly landings at junior worlds LP, although maybe that was due to nerves, as she had great jumps in the EX.
Slowly rotated jumps are of course more difficult to land cleanly than fast ones, so kudos to you if you can do it; but not a good strategy if it brings down your clean-landing %.
"having beaten" -- well, skating is full of surprises, but if you've lost to someone repeatedly without having made obvious mistakes yourself, then your chances are not looking good (not impossible, just less good than if you beat them every time!).
Of course lots can happen over the summer, no one knows how each of the top 3 juniors will improve. Caro & Mirai have age on their side (sadly, we do master things faster and more easily when we are younger), and Ashley has, some argue, the past-puberty factor on hers. But is the latter really true? Asians generally have smaller physique, and Caucasians are taller and have fuller bodies (on average). How many skaters hit their puberty monster after 15?
can't wait to see her skating next season! 
