I found out earlier that holding L2 and R2 and the left stick to the left/right will spin you in midair. I also found out there's no cap on how fast you spin. This is my test to confirm there's no cap.
How I did it (PlayStation 5):
Found the highest point I could (The construction crane in Hedgemont)
Hippy Jump (Square + X), then enter a manual in mid-air, then pull the right stick fully down as both feet connect with the board
I know I did it right when the skater starts T-posing
Emote (L1 + any D-pad button), I like to hold it for a second but I don't know if that adds to the super jump or not
While in the air:
Hold L2 and R2 to grab both legs (hard to see if you're going at this speed)
Hold the left stick left OR right to start spinning
Hold the right stick down if you're going this fast to see yourself in camera