How to setup stabilized tailerons ( Archer Plus SR12+ )

[Whoisbhootru]

Hi gents, I need some help please. I have a 90mm FMS Viper. How do I setup stabilisation on my tailerons?

Tx is X20S, Rx is SR12+, latest firmware and LUA script for the stabilization.

Setup of servos/surfaces is:

2 Ailerons (Ch 1, 5)
2 Elevators (Ch2, 6)
1 Rudder (Ch 4)
2 Flaps (Ch 18,19)

Pinouts on the Rx assigned as above.

Calibration completed prior to installation on the aircraft for both stabilisation sets (1 & 2).
Self-check done for both sets but only successful on Stabilisation set 1 since Channels 7-10 are vacant.

I attempted assigning Ailerons as 1, 5, 7, 10 and then creating Free mixes to map Ail 3 (Ch 7) and Ail 4 (Ch 10) back to Elev 1 (Ch 2) and Elev 2 (Ch 6) respectively and while this works as a tailerons mix, there is no stabilisation on the taileron surfaces (Self check on Stab pg 2 also attempted after doing this but nothing happens)

Need help please, maybe I am missing something really obvious or am doing it wrongly. Thanks all.