Judging by sorting the very stiff and heavy steering on my SIII when I got it the other week, I'd make the relay my first port of call.
How heavy is standard (unassisted) steering on a 2A/3? Mine seems very heavy and I was wondering if I could make it a little better
Does it self-centre when cornering at reasonable speed ok?
If not your swivel pre-load is too high and needs a shim added.
Parking and manouvering is always going to be work in a Series, you just get used to not turning the steering unless the wheels are turning