What about Raiders that hit as hard as a naked ISD (same expected value for damage) and can zip around real fast?
Points Quantity Total
Expanded Ordnance III
ISD-I 110 1 110
Relentless 3 1 3
Leading Shots 4 1 4
Wulff Yularen 7 1 7
Admiral Ozzel 20 1 20
Raider-I 44 4 176
Instigator 4 1 4
Impetuous 4 1 4
Expanded Launchers 13 4 52
Ordnance Experts 4 4 16
396
Four blacks, two blues, with rerolls from Ordnance Experts. Nice damage output, but not much meat on those frames. It also means no ACMs or APTs, but five activations and +8 black dice (+12 with CF) could be deadly. Are you envisioning them zipping around at speed 4 on the attack, or more laying in wait ala the op's picket fence suggestion?