I dont have roll trim on my Calidus andnit tends to wonder to the right as well.
I bought a turnbuckle and use a small bungee attached to the lower part of the cyclic stick.
I can increase tension by turning the turnbuckle and eliminate the roll without hindering stick movement in any way.
i will try to remember to take pics next time out.
Pretty simple setup and not even visible to most unless they are looking for it