Tanner and Taylor have very similar styles.. must have the same teacher
With that said, for Taylor, I'd say she needs to try to let her lower body carry her torso forward. Basically want to keep her nose further back than her belly and stride leg. She also does what my DD often does which is lean into the pitch on release, kind of like Ueno, which I don't know if I'd say is a terrible thing or not, but you definitely want to get taller once you land.
Arm whip issue is similar to Tanner as other's have mentioned, need to work on palm up, etc.
It must be a twin thing as to why they look similar.
Yes, arm whip can improve a ton and I see their speed increasing with an improved sequence, shoulder/elbow/hand in that order.
Yes the nose does need to be further back, thanks.