As far as I know, if you're casting a Signature Spell at a lower level than the base level you have it in your repertoire the best you can do is pick one of your spells at that lower level and mark off a casting of that one. Then again, that's basically how Hero Lab Classic worked.
Currently Running: Pathfinder Second Edition
Currently Playing: Pathfinder First Edition, Star Trek Adventures
Former HL Games: D&D 4e & 5e, Mutants & Masterminds 2E & 3E, Savage Worlds
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