I just looked at your mod Wyvern, and funnily enough, it seems Tartiflette had the exact same idea as you and made a temporal shell Hyperion for his Seeker mod,
the Endymion.To get back on the subject of the Hyperion. I too, have a problem with it. Though i don't think the ship is underpowered, i managed to make it perform pretty well in battle. I had tried quite a few builds, with various success, but i always came back to one in particular.
Spoiler
With a few adjustments depending on the situation, but that's the main idea.
Seems straightforward enough. Get in, shoot, get out, vent. Repeat until you run out of CR. Getting it to work is easy enough. Getting it to work very well is hard. The idea is to have as little downtime as possible. Get in, shoot, not necessarily to kill, or even to hamper a key target, just shoot and hit something, get out and vent. I realized i was wasting an incredible amount of time between two actions. Picking a target, getting into position, avoiding fighters... Precious time lost to CR degradation. Without that downtime, or at least with as little of it as possible, the Hyperion can pump out a whole lot of damage during a battle.
It took me a very long time to be somewhat good at it. Mainly because it feels incredibly unnatural to fly, or rather to teleport, that way. The lower the downtime, the better the Hyperion becomes. Of course, it's much easier to perform well with a proper fleet to keep the enemy somewhat busy. And if all goes well, the entire battle feels like a well timed metronome where you forget yourself in a murderous, mechanical routine. Get in, shoot, get out, vent, do it again. From my experience, the Hyperion requires a lot of efforts to be good, but it can be good.
My problem with it? It's boring.
Getting in that state of "Hyperion flow" isn't as cool as it sounds. Some modded super-frigates get it right, with tight, stressful and exiting piloting. But not the Hyperion, it's a grind. A tight, stressful and boring grind. Which isn't that bad in the grand scheme of things. I mean, i can still play a different style, right? Unfortunately, i haven't found anything that works as well. At least nothing that justify its high price tag in my eyes.
The Hyperion problem isn't a big one like, say, the 0.8 Harbinger. After all, everyone tried the Hyperion at some point, and the majority proceeded to ignore it after that. That's fine, there are other ships to play with. But then we have a ship in the game that people would rather scuttle for supplies than use in battle.
I don't have much to offer for a solution. I think the concept of a teleporting super frigate can work. I think it's just the phase teleporter that could probably have its stats tweaked a bit to emphasize a more exciting playstyle instead of the current metronome.