AFAIK, Sandberg only send their basses out with their own strings, mine came from the factory with 40-100 rounds and I only use flats, I changed them and it set up superbly with an incredible low action, no problem, but I did read, Plek technology scans your guitar's neck whilst strung up and tuned to pitch, allowing it to record the exact state of your fingerboard.
@Tío, it might be worth asking holger if you can send him your strings to fit, I was going to but my bass was made and shipped before I had a chance to ask 🙂