Definitely dropping Tusky as a mobile client for now.
This is the most recent of several instances where I try to catch up on my timeline and past toots are just.. mysteriously gone. Skip an hour here, and hour there, quietly and without any UI indication like "load more".
I may have to grit my teeth and go back to Subway Tooter, as much as the overly cluttered UI bugs me. At least its notifications work.