Next time you're out do some testing with the height floor on vs off, you'll find that with it turned on the drone should deal with those trees in a much smoother manner. Right now it will have difficulty keeping up with you on a MC when it's keeps wanting to return to a low alt and is getting caught low behind the trees causing it to almost stop to swing around the tree and re-aquire, it's also much more likely to loose it's subject during that time. With the height floor on it should gracefully rise up over the tree and drop back in when it's safe to do so and it won't bleed off as much speed which becomes really important following a motorcycle.
Looks like you have the hang of it though, nice job.