mdunn is quite possibly right about the ingrowns since you're experiencing irritation the dat after, indicating a problem with the regrowth. I did, however, notice you said that you won't have irritation though if you don't shave two days in a row, which leads me to assume you're being a bit aggressive with your shaves. Focus on your technique and barely applying an pressure at all--this should improve it. If not, it might simply be that your particular skin responds that way to the extreme exfoliation of shaving and as a result you may need to only shave every other day. Luckily, you are now DE shaving and your shaves should last quite a while!
Best of luck,
[URL="http://wiki.badgerandblade.com/index.php/User:Adonnellyr"]My Shave Den (sorry for the poor man's page layout)[/URL]