Here's a couple of things to look for. Before messing with the pull rod make sure that the height, under your foot, of the two pedals from the floor is comfortable for getting either AND both pedals down without twisting the ankle too awkwardly (the same applies to the A + B pedals). This may not seem to have any bearing on the question, but if they're not right it can
seem like a stiff pedal issue. It's usually a matter of adjusting the pedal-rod length by loosening the locknut and turning the connector. Trial and error 'till it's right. Usually the A is higher than B and C slightly higher than B - the difference depends on your ankle dexterity and how far your 'sitting centre' is from the pedals. It's worth getting this right anyway: it applies to ABC and CBA.
That done, the pull-rod rule is - 1. at bell crank; further from the guitar underside the harder the push and vice versa. 2. at changer; the further from the changer axle the easier the push, remembering there are different holes for raise and lower of course
