The military also evaluated the XM8 and SCAR series for use by our armed forces, but none of them passed trials. The M4/M16 wont be replaced for a long time...
And yes, superlube is EXCELLENT for KJW GBBRs. You only need to apply it to the piston cup and piston. And yes, silicone oil is too runny. But SuperLube is a gel, it wont run all over the internals of your gun.
And if your KJW is still giving you too many problems, PM me and I'll buy it off you.