1. Spectre wasnt said to have the "power of god" in the GA. BW telepathically made Spec sense a danger elsewhere that needed his attention because he wasnt ready to face him in one story. In another he fought Soectre with his mental constructs. Comic Brainwave could create GL like constructs from his mind with sheer force of will. He did so from accross the country and planet. So for example in one story one of Brainwave's mental construct thugs had pulled a crime for him as Spec chased them they shot at an innocent. Spec tried to protect the innocent and then stopped to check on them. When he went after the consteuct is disolved after hiding the loot. In All Star Squadron 19 and 20 Brainwave was fighting the JSA with mental constructs of the entire Japanese military might AND a mental construct of the Spectre. He literally had his 3d mental construct of the Spectre grow giant size and crush Hawkman
Jay in the modern era was likited to sonic level speeds for quite some time. He had had a heart attack and couldnt push his speed too high without risking another. His power allows him the same power level as Barry erc his age and health doesnt.
Johnny Thunder was an idiot 80% + of JSA stories showed him not even remembering/knowing what his magic word to summon the Thunderbolt was. He usually only did so by sheer dumb luck only, and was suprised when the Thunderbolt finally appeared. For most of JSA stories he is as effective and dangerous as Snapper Carr in the JLA
Wizard wasnt far behind Fate in power in most of their stories at all, however Shade is quite a hit above Fate and always was.
The fiddler was a plot device character. That magic fiddle of his could do almost anything and was every bit as powerful as Thunderbolt etc.
Grundy is an elemental that absorbs energy and is particularly partial to magic energy. The reasonnhe was stomping Fate+ Alan + Hourman is because he had absorbed so much of their magic energy (as well as radiation in his swamp) he had developed other powers like moving things will
Most other times it only amped his strength etc. Its literally the reason he's so inconsistent in power level