should for sure be sanded down till theres no more tool marks, then check your tiller again.
I'd remove only 20-30 scrapes at a time, in select spots. go REAL slow. Pull your bow on the tiller
to 55 pounds only, your not gaining anything by pulling it past your desired end draw weight.
Every scraping session you should see your draw length dropping by half inch or so.
when you get to 26" or 27", stop tillering and give all a good sanding. it may need a few more scrapes.
I lost 3 pounds on my last bow from sanding in the end, i should of removed all tools marks a little earlier.
good luck!