[Yaesu] FT-101zd question

[rb]

In the FT 101zd manual, page 14, I see this instruction:

"Again rotate the LOADING control and PLATE control, each time advancing the
DRIVE control approximately 2 step, until the DRIVE control is fully
counterclockwise. The transmitter is now tuned for maximum power output. Do
not exceed the maximum tuning time stipulated previously. Return the VOX GAIN
switch to the VOX position (out of the MOX position, return the METER switch to
IC, and return the DRIVE control to the fully counterclockwise position."

This is a different process than I normally go through. What I do is set DRIVE
to 150-175ma, and keep it there. Different things I do cause it to go up or
down slightly. I just re-tweak it to wherever the plate currrent is I want to
be at. I just switch over to USP/LSB from CW tune, leaving it right there.

Going by the above process, it looks like you could easily get "over-drive"
(loaded more than you'd like) by going to full clockwise. Than, going back to
full counterclockwise seems you'd have zero-drive.

I'd certainly like to know if this is the correct tuning.

What keeps is from going into "over-drive", and what would make it be zero-drive
if at fully counterclockwise position?