In order to properly generate an HDR image, your *brightest* image has to have the correct exposure for your darkest areas, and the darkest image should have the correct exposure for your brightest areas. In other words, you need at least one more lighter exposure for the hillside, and possibly a darker one for the sky. You're trying to force tonalities in tone mapping, and that's where the grain and blotchiness is coming from.
You should also be shooting in RAW, preferably, so you can do the HDR merge with 16-bit images.
Photomatix Pro is the software of choice for this work, so you're fine there.
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