Did some more testing and it seems as it is present in the HUEY as well ... just reversed, mening that the stick is moved back towards the center after i release the Trim button
However, simple fix seem to be to use the VPForce trim function, with forced spring effects turned on, and bind it to the same buttons as in the DCS config and keeping the DCS button config as well. This worked great in the 24, will try the UH1 as well