Yup, I remembered to set my throttle a little short from before, but apparently I didn't leave a wide enough gap. I tried it again, doubling the gap to a squished pinky tip width, and now I can reach 32 vs. 25, so that appears to have solved the problem.
I couldn't figure out a way to keybind 100% throttle for the buggy, but for the ship I get 210 with both the throttle and keybind.
Also, I think my config somehow got deleted. I'm sure I had some curves on the mini stick, but they were straight. So I reset those, and also calibrated them a little short to ensure full range.
FD really should have an in-game calibration range check - like they had on DOS games 30 years ago.