I can't remember if this is mentioned in a previous issue or a later issue, but Firestar's reluctance to use her powers at full-blast is because at that level the radiation from them (they're microwave based) actually damages her cells. If she ever went Omega-level her mutation could kill her.
(IIRC later in this run Hank & Tony make her a costume that has built-in radiation shielding)
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pari
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Date: 2014-07-07 01:27 am (UTC)(IIRC later in this run Hank & Tony make her a costume that has built-in radiation shielding)