Leaf Spring Selection

My hotchkis pass leaf sagged after about 1.5 years and 1 mile. :( I'm not the only one with this issue apparently. I'll go with afco or MPP for my next set.

The MPP stuff sits like a damned 4x4 truck. That's my issue with them. The Afco might be an option.

How did it sit an perform prior to sagging?