The car: 1956 356A with OEM VW steering box.
The symptoms: Vague unweildy steering when straight ahead or just entering exiting a corner. No problems once on lock and actually cornering. Steering wheel feels very stiff to turn. Not keen to self-centre. Car continues to track around gentle corner even when steering wheel released part way around corner. Feels like I have to steer too much at the transition from straight to curve, but having entered the curve I have to 'un-steer' to avoid oversteering. Same on transition from curve to straight. All this at ordinary 30-50mph driving speeds.
Other Relevant Info. 'Run of the mill' aftermarket 15" by 5 1/2" wheels all round with new 165 tyres. 32 lbs pressure all round. Wheel alignment recently done, 2mm toe in at front, all new tie rods and ball joints, link pins, shims in correct places, OEM steering rack reconditioned. I have not had the rear wheel alignment done (yet).
My thoughts I don't think it is due to incorrect offsets or tramlining - these are bog-standard after market 5 1/2" wheels. My tyre pressures are probably too high and I could experiment, but I don't think that explains the stiffness. I'm inclined to think that the steering box has been 'set' a bit too tight, and that I could loosen off the lock nut, undo the screw 1/16 - 1/8th of a turn and try that. But before doing anything I'd thought I'd seek some advice / comments.
Whaddya reckon?

All opinions much appreciated.
Dave
Australia