Wow, surprised you're still cold with all that on.
On the topic of base layer bottoms, don't be afraid to look a little uncool, it doesn't matter. No one sees it under your outerwear anyway and even if they do who cares at the end of the day.
I lived in a house with Nev from SnowboardAddiction.com and we used to joke that he was the most uncool looking pro snowboarder ever when he stripped down to his base layers and walked around the house. He didn't care and neither should you.
As for what I wear on the slope, honestly it's almost the same as you:
1) Base layers
2) Thick fleece
3) Shell jacket + pants
4) Helmet + airhole bandana
5) Snowboard socks
That's pretty much it, although I'll wear a second fleece on the rare occasion when it gets really, really cold.
You might want to look at getting a thick puffy jacket/pants combo if you're still cold since it seems you're already layering properly.