Lower the rear by 1.25"...and axle now sticks out 1/2" on driver's side...what does that tell you ? I swapped from BMR adjustable PHB to whiteline watts link..and never looked back. Since I have 12" tiles in the kitchen, I simulated the PHB, and suspension going in an arc, all at full scale..using several 5' steel rulers... + giant protractor etc.
One end of phb goes to axle on driver's side. Other end of phb slopes upwards to car body...on pass side. As the suspension goes up/down.... the PHB is now either too long...or too short. On a corner, hit a bump on pass side rear, and suspension goes up, PHB is now too long, other end of phb pushes on axle on driver's side, kicking the entire axle out..... taking both rear tires with it. You only need to kick it out 1/32 - 3/16", to get that.... 'hang on for the ride' feeling... when flying around bumpy corners'.
This is where the watts link shines. Rear Suspension can go up /down, on driver's side / pass side / both sides...... and (several hundred lbs) rear car body is no longer flailing side to side. Car is more stable on bumps.