i find my self fighting between trying to find the right font and and graphics kit to mesh together for the placement of the number to look fairly decent. not sure if anybody else has this issue or im just ocd :-\ lol.
You can somewhat adjust the position of the in game fonts for bike and rider with the font's config file. There are values for x and y position so do a bit of trial and error to make it look good. I think you can also adjust spacing and maybe size. Still, would be great to have all of this improved and implemented in game