I don't really agree but I am very new so feel free to point out any errors. I'm not saying high-tech being too strong (or low-tech being too weak) is not an issue, but SO can be considered in isolation.
You can't assess in isolation because it scales existing values. The ship mechanics and stats are required variables to gauge it's effect. It's not flat bonuses by size, like Heavy armor mod, it's scaling existing stats on a multiplier. Now that I think about it, SO shouldn't be a multiplier, it should be a flat value based on size.
Last time I checked the speed bonus
is a flat value? Also ships of a certain DP tend to have similar flux venting stats which SO doubles. It's not like maximum flux vent for similar class ships varies widely, outside mods like Scy nation which is a very exceptional case. Low-tech has slightly lower venting which, in a vacuum, you can say generally get less benefit from this portion of SO. However they are slower and the speed boost is flat, so they get more benefit, again in a vacuum, from this part.
SO seems to have a particularly broken interaction with the Hyperion due to the ship's system (I wouldn't know because I don't abuse SO). However the Hyperion is ridiculous without SO too. I think this kind of analysis is a red herring. SO is broken and gives an unexplainable magical ultra performance boost which enables you to outpower ships of higher classes and outspeed ships of lower classes at the same time.
Shouldn't be in the game, jmo.