EWRAM:1773A is much higher for Deep Claw then any previous vehicles I paid close attention to. Deep Claw is known for having the best jump in the game so it is incredibly likely that it is indeed the jump stat.
I went ahead and renamed a bunch of things that were either not labeled or incorrectly swapped around in your script. A bunch of accel addresses were marked as max/min speeds and vice versa:
During game play
EWRAM:14930[Size=0xD0][Count=5?] Machine data
EWRAM:17720,1u[4] - Acceleration (by gear)
EWRAM:17724,2u[4] - Top Speed (by gear)
EWRAM:1772C,2u - Hysteresis friction (boost maintenance)
EWRAM:1772E,2u - Hysteresis, speed to fall to when over limit
EWRAM:17730,2u - (Boost acceleration?)
EWRAM:17732,2u - (Boost top speed?)
EWRAM:17734,2u - (Boost hysteresis friction?)
EWRAM:17736,2u - (Boost hysteresis?)
EWRAM:17738,2u - Boost timer
EWRAM:1773A,2u - (Jump?)
EWRAM:1773C,1x - (0)
EWRAM:1773D,1u - (change in speed?)
EWRAM:1773E,1u - (released acceleration friction?)
EWRAM:1773F,1u - (braking friction?)
EWRAM:17740,2u - (Turn)
EWRAM:17742,2u - (Balance)
EWRAM:17744,2u - (Blast Turn Balance)
EWRAM:17746,2u - (rotation?)
EWRAM:17748,2u - (rotation?)
EWRAM:1774A,2u - (LR)
EWRAM:1774C,2u - (rotation?)
EWRAM:1774E,2u - (rotation?)
EDIT: Never mind saw something with a much higher 1773A than Deep Claw. Could be divided into multiple stats though or be more than one byte.
EDIT2: Pretty sure it's 2 bytes so yeah that's it.