Hello there!
Simply put, the throttle does not work as intended, I feel, on my joy stick set up I have a throttle control, with a 180% axis (0% being pulled back fully, 180% being fully pushed forward.)
For the activation of throttle down, you need to bring it to 0%, that then reduced the throttle down one gear
A better system would be from 90% to 0% bringing it from the first rewind gear then second, 90% being neutral and then pushing forward should change to first forward gear at 135% and second forward gear at 180%.
In short, it needs to be a analogue system rather than fully a key press system.
I hope that