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There is bound to be a relief valve somewhere on the pump which determines the maximum hydraulic pressure hence the amount of power assistance.
Knowing how many strikes the car factories in France used to have; French cars will often be a pick-and-mix of components from different suppliers. Speedometers for example might be Jaeger or Veglia.
What if there was two brands of steering rack and two brands of power steering pump? If one type of rack needed a higher pressure than the other type of rack this might explain a few things.
A good check on steering that is easy to do just needs a large level empty car park that has no obstructions. Drive the car slowly at full lock then let go of the steering wheel. The wheel should spin back to the straight ahead position by itself. If the wheel does not spin back there is definitely a fault such as seized binding ball joints or other seized components. Try the test on both right and left full lock. On some cars the bottom ball joints only last for 30,000 miles before they are in a bad way but for "sealed for life" to work, the grease, the rubber and the steel all need to be to Milspec . Potholes and sunken road drains don't help matters either. OK the Peugeot 405 uses Macpherson struts but nothing lasts forever.
Good luck but it might just be a case of needing three Weetabix!
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