Moving the pedals will not have made the brakes spongy. The pushrod adjustment will affect the dead travel before the brakes start to activate. The usual problem is that, in the extreme pedal positions, either the brakes stay on (push rod too close) or you don't get the full travel on them (push rod too far away - but this is unlikely). Any sponginess will likely be down to air in the system (bleed brakes), water absorption (replace fluid) or a leak somewhere (master cylinder?). Fluid should be replaced every 2 years minimum.
Yellow SL #32