ISTR the stated pressures on the sticker are, as MB, a little unclear for the typical owner here.

In MB's the pressures are stated as x but when you look at the load and speed guide (matchstick men luggage and speed in kms/hr) they are for high speed and full load running and you are supposed to deduct 4psi for 99% of us, rather silly way to state the pressures but probably decided as putting the company at less risk of litigation overall.

My son has a later 325 estate on 17's so his pressures are no use to you, but he mentions the label isn't as clear as it could be.

From memory of the family 320 compact and coupe on your size tyres it was around 31f 32r, but please don't take that as a guide...its what my MB of similar size and weight runs at too.

The tail happy tendency of the cars is as much down to tyre choice and idiots thinking they can apply full power on greasy bends and roundabouts as much as anything, any RWD car will behave the same unless it has the latest traction systems (not infallible) which cut the power or brake individual wheels, where doing the same in a FWD will normally see it run wide instead, easier to recover for most...you still hit the same scenery when it all goes wrong but with a FWD the impact will be at the front.