I think it’s hard to evaluate Tempest alone, some form of comparison with the competition is necessary.
Have a look at some of the existing 0.95 frigates stats:
I find it interesting that Hound and Tempest both have 180 max speed. I we ignore phase ships and mobility-oriented ship systems, the next below are Omen at 155 and Wolf at 150. Also Shepherd and Tempest both have drones. And, IMO Tempest does not have strong weakness. Of course Hyperion has crazy flux stats.
In previous versions of the game Tempest was the de facto practical / general-purpose super-frigate of the game. What made it and still makes it so strong? It is
very small and
very fast, has high burst damage with appropriate weapons used together with its ship system, has good sustained damage with appropriate weapons (which
is was mostly unique for a high-tech frigate), it comes with 2 good “free” drones, AI is quite good at managing it.
I can’t stress enough how small size and high speed are important both offensively and defensively. This with the free drones, high burst damage and no weakness (see above) seem quite unfair to most other ships.
Now in 0.95 the new Hyperion is king. But there are other high performance frigates: Omen, Scarab, Shade and Afflictor. And arguably, all those 5 DP to 15 DP high-tech frigates over-perform in various ways. Mainly because of their mobility and high burst damage potential. Omen worth 6 or 7 DP? Scarab and Tempest worth 9 or 10 DP? Shade at 11 DP and Afflictor at 12 DP?
High-tech frigates used to have a true downside: lower peak performance time. But through officers and various skills, and possibly built-in Hardened Subsystems, the downside has mostly vanished. I do not consider the higher DP a downside, considering current performance.
(not to mention the boost given to Pulse Laser, IR Pulse Laser and Ion Pulser)
Trying to answer the initial question, as an alternative to or in addition to removing/reducing drones and the ship system, IMO another acceptable option would be to reduce Tempest max speed to 160 and downgrade the other mobility stats. Also, consider applying a peak performance time reduction to all high-tech frigates and then adjust the DP so that DP is better aligned with actual performance. An alternative to this would be to reduce the effect of the various PPT boosts. This could be viewed as an indirect buff to low-tech and midline, by asserting that they are the ones that can stay longer on the battlefield.
Direct buffs could also be applied to low-tech and midline. +10 or +20 max speed here and there. A deeper flux pool without changing dissipation could also be appropriate, especially for Hound, Lasher and Vigilance. Actually, thinking aloud here, maybe equalling or even reversing the max flux situation with respect to the various tech levels could help bring some balance: bigger flux pool for low-tech, leading to longer sustained damage output. Though that would mean tweaking shield stats. Hmm, maybe I’m just crazy.