Hi Razor,
Here are the settings for my Natrix:

Throws (at the root/inboard edge)
· Ail Up (hi/lo) 30mm/24mm Ail Down (hi/lo) 27mm/20mm·
. Elevator Up 19mm Elevator Down 27mm·
​​​​​​​. Rudder L/R 45mm
· Flaps T.O. 42mm (mix 6% elev down) Flaps Landing 97mm (mix 10% elev down)

CG: 383mm

I fly mine with a Jeti DS24 and a Cortex Pro. These are the settings I use.

Expo:
· Ail 27%
· Elev 25%
· Rud 30%

Gyro gain:
· Clean (flaps up) -32%
· T.O. flaps -42%
· Landing flaps -50%

There is a lot of personal preference with expo but I like the feel of mine with these settings. You might want higher expo if you are not running a gyro. My Natrix weighs just over 17kg (dry) and is very lightly wing-loaded. It flies beautifully but be ready for it to float on landing.

Good luck with the maiden!

Craig