Hey @Lammy have you solved this in the end?
I'm trying to handle this arrows misplacement problem with my tick data (single-tick value).
The only solution that I've found is to call:
This way the arrows will be printed above/under the priceline and maybe, as in my case, too close to it. But I think is better to have it too close than not having at all!
Errata Corrige: this solution will lead to many problems when plotting more than one datas, I'm currently looking for another option to solve it!