I have set the linkage at min on servo end and max on the carb end
I have the low EPA around about 80% with a really nice low tick over and the high EPA on 100% with the carb set full open.
I don’t think I could adjust the linkage any more without it binding.
So now (after listening to your advice) I shall back the high EPA down till the rpm changes (using a taco of course) then back up and add another 5% on so that i definably have full throttle.
I'm using a Futaba FF9 9cp so I will play with the throttle curve little to see how that makes the throttle feel.

Many thanks for your advice

Merlin