I don't really know why long range is such a taboo for high tech. Conquest is fast as hell and allowed to kite with 2220 range gauss cannons, why is 1575 range Odyssey unacceptable then? Similarly, Falcons are about as fast as high tech stuff, yet they can use 1650 range kinetics.
I wrote ships with L energy mounts, not high tech.
Sunder's main drawback is that it's fragile, getting a 900 base range hardflux weapon with focus would be a big buff.
Apogee/Champion main drawback is being slow, same there. Quad Mjollnir Paragon would also be a real pain.
Gauss has atrocious turnrate, much lower DPS than Mjollnir, does little against armor and Conquest has really, really bad shields with mediocre armor.
It's nice for fire support but dual gauss Conquest and dual Mjollnir Odyssey aren't comparable, they do very different things.
+if Mjollnir keeps ballistic mastery bonuses it really starts stepping on plasma's toes (also 1665 range, not 1575 in that case).
If it counts as energy that's a pretty big nerf, it's already situational for the ships that can use it now.
Mjolnir as synergy may be okay if it counts as Ballistic for buffs. (So, no -10% flux from elite Energy Mastery.) Still kind of leery of 900 range on high-tech ships. I would certainly kite further away with such high-tech ships.
Elite ballistic mastery would be obviously, no contest better for Mjollnir than elite energy IMO.
+90 range, +40/20 damage/hit, +33% projectile speed. It's generally a great skill.