While the FAQ may be for a different transmitter, it will work the same for your transmitter.

As per the % on the master and slave, this is why I pointed you to the first FAQ as it will tell you:

"To be able to trim your second elevator servo, we would suggest first that you of course do this by hand at the control surface, but if you still need to do a little more trimming you may of course go into your sub-trim menu to make further adjustments. But if you are wanting to trim in flight, you will need to purchase a Synchronizer."


Sincerely,
Krysta
Product Development & Support Specialist
Futaba Service Center USA
[email protected]