So I have had some issue with my intermittently bad connection and the rubberbanding you speak of. I did find that once I worked to resolve as much of my end as possible things have been a lot smoother for me in Boundless. It’s still not perfect but much better. The main thing is to resolve dropped ping, which would cause a lot of the rubberbanding. Check your ping to the internet through command prompt or even more thoroughly here: http://www.dslreports.com/pingtest
Then check your ping to the boundless servers. http://status.playboundless.info/PingTest
Run your ping test for at least 5 minutes to see what your percent drop is. IF you are dropping. Try to resolve through checking your cables and hardware. If your internet down is slower than say 3mpbs you could adjust the chunk down in game settings- network.
Here are some helpful responses that I received on my issue as well. Minimal ping loss results in unplayable connection
hope this helps. my intent is to help, not to harass.