Using the spring tension adjuster at the cage pivot, one can alter the balance of spring pre-load on the A (cage) and B (mounting bolt) pivots, to better preserve radial distance from the rear wheel axle to the guide (top) pulley.

I've done this, but in the opposite direction, to move the top pulley closer to a 24t big cog, for more-responsive shifting action (pictured below).
I am recalling that turning the pivot bolt with a 5mm Allen wrench at first seemed counter-intuitive as far as the turning direction, before re-tightening the locking hex nut on the cage plate with a (12mm?) open-end wrench. But really couldn't have been much easier.