In this part you can see how the "slap" and thumb techniques work in unison. I begin slowly, and as I build speed I gradually move from the "slow version" of the verse bass line to the line played in the performance section, and as I move the the tempo beyond the initial 120bpm I'm sticking to that more and more. This is just something that feels more natural to me, but experiment with it yourself. You might find that the opposite holds true in your case.
Now go try it out over the backing track and keep it groovy until next time!