I think you focused on the right things! It felt really good to drive (though I wouldn't complain about an even higher speed cap!) and it's only a jam entry anyway! Maybe more loops in the existing track too? There's a counter for the loops at the top, but both loops are near the start, so after that it feels a bit like you've achieved your goal and are just waiting for the end so you can go again?
Though, again, it feels good to play and I think that's really important.