Thanks for the link Pete, just had a quick read. I think the problem I found when playing a Stagg (long time ago, memory like a sieve) was that the bridge was very flat so when playing with the bow I kept catching 2 strings. I do seem to remember it being "an odd" bridge, not a normal db bridge and didn't fancy trying to re-shape it at the time, plus the bass didn't actually belong to me.
Can you post a pic of the bridge?
These days after dreaming about owning one for a very long time I've got a Bridge electric double bass which is probably one of the closest electrics to playing an acoustic bass.