M1A2 Abrams SEP v2 TUSK II

Academy specifies Humbrol 121 Light Stone as the color for FS33531, the current color for M1A2s. From left to right, Humbrol 93 Desert Yellow, Tamiya XF-60 Dark Yellow, and Humbrol 121 Light Stone. I think it's -waaaay- too light. 

Drilled and stiffened with brass model tubing. 

CROW. Styrene parts with rubber and PE. 

First issue with this kit. Warped barrel. Any ideas?