It really is hard to tell from the video, it looks mostly fine/smooth to me. Probably doesn't help that the video is recording at 30fps. I don't think it's a big deal on something that the user normally wouldn't be focused on, especially at high speeds. The wheels and train and tracks look great (from the video at least, I don't doubt that it's worse in person as you mentioned).
I have a minor suspicion you may be nearing the limits of your device, as the fps as shown was at the low 50s and even dips below 50 at the beginning, and you said it looks fine on PC. I wouldn't normally call that a stable fps. I do note that it gets back to around 60 in the latter half, but I'm also not clearly seeing your jank/jitter either.
If I were to pursue this I would try taking everything out except the foreground plants (especially any physics actors), and seeing if it makes a difference on the device.
Edit: Any parallax on the layer? Or just varying speeds between foreground and background objects?
Another long shot to consider - are you updating your debug text every tick? Try disabling the text updates to see if it makes a difference. I've had issues with this before where my debug text was slowing everything down, although mine was significantly more text objects to display the contents of a data array.