C0 Mavuika combo/rotation (or: how do I get her off her motorcycle!?)

I'm trying to learn Mavuika on an account that my friend was piloting, and am finding her kinda challenging. Hoping for some guidance!

The main issue that I'm having is that I'm not sure how to reapply her tap skill after her ult. I'll do the ult, run donuts around the enemy, then try to tap her skill once, however it seems to do nothing. She just keeps riding. I have to do about 3 taps to get her to get off the bike and apply her off-field skill. What am I doing wrong here? Should I just be swapping straight to supps after her donuts? I tried to do that once, but it seemed like her off-field pyro wore off and I couldn't get her ult back as quickly?

What I usually try and do:

1. Mavuika tap skill
2. Support buffs/shields/etc.
3. Mavuika burst
4. Desperately spam E to try get her off her bike and reapply her skill

Sorry if these are silly questions, I genuinely tried to find the answers but couldn't find anything. Would love to know whether I'm doing wrong here, or whether it's potentially my keyboard/lag.