I have never seen a max damage q8 insc spear or scythe of any color. My bet is that they don't exist.
Once NF was released, anet changed the drop template. This was the time when the big nerf hit most q8 drops. Before NF q8's dropped much more than after in the swords, hammers, shields, etc. Knowing this, I'm tempted to say with near 100% certainty that there will never be nor has there ever been a max q8 insc spear or scythe of any color.