I have the Calmini 3" kit - so shackles, shocks and AAL in the back. I am running with motor and transmission skid plates. I also occasionally trailor loads and run with heavy equipment in the back.

Has anyone had their spring pack re-arched?

Not really - I'm just back to rubbing my 32"s on the body metal on the upper wheel well - which doesn't sound good, chews up tire rubber and risks creasing my sheet metal.