I don't have Lightroom, but on my version of Elements both of these adjustments can be done in the raw converter. Close the converter by clicking done and your raw images will retain the adjustments you have just made. Then you can merge them.
If you want to edit any of my images to demonstrate points/techniques to either myself or others please feel free to do so.
Still learning with Canon 40D, 28-135mm, 100-400mm L and Elements 6.
Any Advice greatfully received.