[Suicide Junkie]

I would suggest that you give your weapon "normal" damage type.
Most shields won't stand up to that kind of beating anyways, but planetary shields should be able to help absorb the first hit. (I've boosted MPSs to do 10k or 20k of shields)

The Name & Description, "Spinal Mount I" sounds like a mount, and I'm quite sure that weapons use up energy, rather than forming it.

How about something like:
Name: Massive Pulse Cannon
Desc: An vast energy capacitor system which channels all of a ship's resources into firing a single burst of energy.

Statistics:
16 range, 8000 damage, 5 reload, 1300kT
Damage Factor: 1.23

Comparison to standard weapon: PPB, DF=1.7
Comparison to standard weapon: APB, DF=1.5
Comparison to standard weapon: CSM, DF=0.8
Comparison to standard weapon: WMG, DF=0.66

Looks like you've got a reasonable damage factor, but I would suggest increasing the reload to 6, since the range is so high.
That would give a damage factor of 1.03, which is still quite high for a long range weapon. (and a planet-buster too)

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I think that this weapon would easily be unbalancing, since it can be used to wipe out a planet so easily. One shot and the planet is toast, no matter what.