Missing light armour proficiency (unless you intend for all telekineticists to wear exclusively medium armour..?)

Regarding force blast...
I would love to see a Colossal longspear (144 lbs I believe) being hurled by this. That would be 6D6 +2D6/10ft unused distance (if you're not proficient with a longspear anyhow). That means a level 6 telekineticist could hurl this spear at point blank range (assuming 10ft travel minimum) for a total of 16D6 damage, unless the bonus d6s from leftover distance of objects and the leftover distance for piercing/slashing weapons are NOT meant to stack.
Am I missing something, or is this just horrific?