Hello Oliver,
What version are you now using? The latest is 2.2.5. Beginning with 2.2.0, I added Tasker variable support for target and port, and then in 2.2.2, Tasker variable support for timeout. But there have been some issues with compatibility with existing Tasker profiles. Versions 2.2.3, 2.2.4, and 2.2.5 were bug fix releases for Tasker integration. It sounds like you are still hitting an issue in this area.
Can you export a Tasker configuration (from Tasker) that contains a Send/Expect configuration that is misbehaving and email it to me? Also, what version of Tasker are you using.
Thank you,
David