Hi kramer65; to chime in as well, I have a similar issue (trackpad sometimes behaves in the erratic manner you describe, other times is more unresponsive), detailed in a thread I posted a while back:
All I’ve been able to find online (non-Librem specific) is that there might be a grounding issue that interacts with some trackpads in certain environments. I don’t know of any way to resolve it, however. (For example, see: Found hardware solution for erratic Synaptics touchpad / clickpad / Laptop Issues / Arch Linux Forums).
Hopefully we’re able to hear from others that may have a solution; my use for the Librem is similar to yours, moving around a lot, not ideal for lugging around a mouse between meetings, etc…