I was indeed referring to the compensating lever.
Best guess would suggest your first instinct is good for your particular car. I suggest you fit the 4.25:1 servo to the front and then get your brakes tested at an MOT garage. If the rears seem to be under performing relative to the front you can then take a good guess at how much extra boost is needed.
Definitely better not to overdo assistance to the rear brakes. I have a 403 with discs on the front and many years ago I made the mistake of replacing the rear wheel cylinders with standard 403 items. I had to brake suddenly when I met another vehicle on a narrow lane and the rear of the car tried very hard to overtake the front. Very unnerving.
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