Only thing that really needs a buff is SGE's Icarus and Toxikon I (Toxikon II is okay at the moment). Either 2 charges or a lower cooldown on the gap closer will fix the issue of SGE having a really long cd on their gapcloser. Toxikon I is currently only used as a mobility tool with DPS loss, even in AoE because Dykrasia I is 160 potency whereas Toxikon I is 240 + 50% falloff AoE. You basically use Toxikon I with 2 targets (360 potency), and only 2 targets, which is a rare occurrence. Dosis does 300 potency. Dykrasia does 320 potency on 2 targets, and only does more on 3+. Thus, there is very little point in building Toxikon I up.

Toxikon II removes the issue of being a direct DPS loss since it's DPS Neutral with Dosis III (unless you're forcefully trying to develop stacks during combat instead of pre-pull and transitions).

SGE isn't meant to be a 1 to 1 duplicate of SCH. They're different jobs, so their skills have different caveats when working together. SGE has Taurochole + Addersgall regenerating every 20 seconds as opposed to SCH having Excogitation with a 3 aetherflow per 60 seconds. As the speed of resource generation differs, so does the order in which you cycle resources. Rizomata generates 1 addersgall, which can be spent for any addersgall skill - including SCH's Sacred Soil Equivalent. They can also use this ability to hold addersgall for a longer duration. SCH cannot, as Recitation will expire after a certain period of time. Instead they can force a crit on Succor/Adlo/Indomitability/Excog.

SCH has Dissipation, which works as a recovery tool when everything horribly wrong, or as a DPS tool. SGE has Soteria and overall stronger mitigation-to-healing in their regular healing rotation when stacking with your enhanced healing action buffs (Physis II and Krasis stacking together can superbuff your heals), which generally prevents them from ever reaching that scenario in the first place.