Yes, you definitely still need to trim when using a clutched springless cyclic. If you turn on the control indicator window, on the cyclic axes you'll see a red X (trim position), white diamond (physical stick position), and a green cross (SCAS system output). The SCAS system takes the positions of the red X and white diamond, does some math, and outputs the green cross. The closer together the red X and the white diamond are, the better the system works.
I find it works best if you hold the trim release up when doing large maneuvers. This locks the red X to the white diamond, guaranteeing full SCAS authority. Once you're settled in cruise or hover, periodically tap the trim release up as you are making small attitude corrections to keep that offset minimized.