I had a quick look at the videos. The main prob I think is you are singing too close to the mic. The optimum distance should be about a four inch gap between lips and mic. Move away a bit for louder notes and a bit closer for quieter or lower notes. I am not a big fan of using these foam head covers as they lose much of the high end of course you are outdoors and you need to try and eliminate picking up wind noise so a compromise is needed.

One good thing about recording dry vocals is you can experiment with various fx till you get what you want.

I also like a bit of plate. It is about the only thing I use in a live performance.

http://www.soundclick.com/bands/songInfo.cfm?bandID=687727&songID=5238055