the control arms that DSE gives you are the same in the speed1 kit and speed 3 kit, if the tech told you it wasn't necessary because it was fixed in the control arm....umm..he's wrong....sorry tech dude, that is why on the higher end speed3 kit you sell a control arm relocation bracket..(also known as the guldstrand mod the hard way) and that is how they fix (SOME) of the camber curve issues (its only fixed by changing the pivot points) the tube arm mounts to the same spots as the stock arm there for the camber gain is the same as stock..so you must either do a DSE control arm relocation bracket, a guldstrand mod(same thing) or a tall ball joint...mind you IT WONT FIX IT!! all these just start to give the "no camber gain" designed GM suspension some camber help...so recap...do one of these......if your not running a tall spindle...
DSE relocation kit
Guldstrand mod
tall upper ball joint