It's getting hot because you're missing an Emitter resistor, as that's an Emitter Follower which can't provide you with voltage gain, only current gain but I see no need for the Darlington NPNs anyway. The FET doesn't need any drive current to drive the Gate, it only needs sufficient voltage @ a few uA, and that small current is only flowing in the Gate resistor. What FET model are you using so I can check the data sheet on it? If the 5V from the Pic is not high enough then we can use those 2 NPNs in a Common Collector configuration. That is if they haven't been smoked yet.
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