1) Make the summons spells scale like the Golem instead of the animal companion, and lock duration at 10 rounds (20 with Extend Spell). The summons are immune to direct spells like the golem. This way, the summons can no longer be buffed, but spawn as self-sufficient. A 10 round duration is sufficient for 1-2 encounters, but is not so long that you can just drag it everywhere.
Summon Creature I will be about 60% of CL scaling, with every level adding 5%, so a Summon IX will do the equivalent of summoning a Golem for 10 rounds.
Special summons, like the Warlock's "The Dead Walk" or Epic Gate can have custom scaling and durations.
2) Change Golem Mastery I-III to Summoning Mastery I-III, and decouple it from Mirror Golem. Mirror Golem remains a standalone feat that effectively creates a permanent Summon Creature IX. Summoning Mastery will have the same effect as Golem Mastery, but apply to all summon spells.
This re-purposing of an existing feat means that casters who do spend the feats on the Mirror Golem aren't SOL for 4 feats once their Golem dies, as they can summon a creature as a temporary replacement. It also prevents feat bloat, as no new feats need to be taken for this purpose, and a dedicated summoner build needs to burn at least 3 feats on Mastery to summon a strong creature.
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