Some of these designs are very nice.
Wicked Dipper's nice, although you had enough track to make a block brake run at the end.
Frigatebird's Flight... loved the flow of the track from the first drop up to the loop. It was fun to watch. The batwing and the half-loop + twist were unnecessary and only added more intensity IMO.
Dynamite Train's good, though the brakes right after the last drop... not my cup of tea. Too sudden.
I liked Shangri-La a lot. It could've had a MCBR after the 4th drop and a bit more twisty track in the end, but it's great. Support work's also nice even without custom scenery.
Roaring Beast... fast, exciting, intense. The loop was well-timed, the water splash was a nice addition. Liked the layout even though IMO it's a bit too spaced out. It also would've been better with the regular Wooden RC trains.
Pharaoh Frenzy's a good reel. Great flat land addition.
Daredevil's a great 4D, the only flaw I could find being the 2nd run (after the MCBR) is way too short.
A.I.R. is very good. I don't have any complaints with it except for the 2nd helix. Probably redundant. But it's nice.
Mister Twister's pretty good, though it could fit more than 1 train in the circuit easily.
Dragonfly probably would've also benefited from a MCBR.
I particularly liked how some designs felt smooth and free-flowing. Keep building! I'd like to see more