My point stands. If you think those are good examples of an acceptable power level, than giving the Dragonheart Mage full casting is no problem. Otherwise, it depends on what you think an acceptable power level is.

Assuming you're fine with sorcerers and core and all of that, I can't see any problems with bumping Dragonheart Mage up to full casting. It still won't be as powerful as some of the other caster PrCs out there, so it shouldn't be any big deal.