I have been running KYB AGX with Vogtland springs for 7 years now and they been a huge improvement over stock. I also don’t notice any rear end sag issue.
How many miles on the AGX until needing replacement? I've been thinking about doing this in the front especially...
Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon