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is the mic side input too sensitive and too off, to calibrate correctly?
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Yeah, the the mic input will offer too much gain since actual mic signals are quite low in relation to line level signal (such as the SPL meter outputs).
This extra gain at the mic inputs front end usually results in increased noise.
In addition, mic inputs usually enjoy a very limited bandwidth that is designed to comply with a narrow voice frequency range that a cheap microphone would supply.
It's just a bad idea to try and use a mic input. If you have a line input, then there is a way to make it work.
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The soundcard is almost too complex.
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We run into this all the time. People go out and buy some soundcard that could be used professionally by a recording studio, just to use with REW. We keep telling eveyone, that the best cards seem to be simple stereo el-cheapo cards that REW can create a soundcard cal for. That's what I use. It's some piece of junk I got at Futureshop in the bargain bin with a broken taped up box. Works great.
brucek