HOORAH!!!!!!! I"VE DONE IT!!!!!
So, after all that, I ended up going back to trying Get Rotation, and setting a variable on the Y Axis, and using Float Compare to set Boost Left or Boost Right.
My mistake when I tried to use it before, was comparing the float value to Zero, when I expected the Get Rotation variable to give me -90 (facing left) or 90 (facing right).
It threw me when the Get Rotation variable gave me 270 (left) and 90 (right), and I had a mental block thinking it had to be compared to Zero... But, all I had to do after all, was set the Float Compare value to 91 , not Zero !!!!
So, it was set up as Less than 91 - boost Right, Greater than 91 - boost Left.
I've now got a really cool control system, using Forces and physics, gravity etc.
I'm so happy!
Thore... thank you for all your input and suggestions, I've certainly been forced to explore a lot of different actions and logic break-downs in the quest to resolve this problem, which is a great way to learn.
We learn the most when we're faced with brain-melting challenges.
This has now been officially SOLVED ! Boom!!!
