I'll tell this to you as politely as I can b/c it took me a while to figure it out. 400 hands mean nothing!! I play 400 hands/hr and there are guys on here who double that amount.
Let's look at the long run, I mean, I don't even play many hands, maybe 10k hands a month, which isn't much. But that's 120,000 hands in a year, what's 400 hands in reference to that? Not a whole lot, you're going to have variance, even at the lower stakes, it's just going to happen.
It's OK if you have a stretch of 400 hands where you aren't hitting flops and you are not making money. What's not OK is beating your head against the wall and continually cbetting into calling stations and players who like to float you. Make sure you are choosing the correct boards to cbet on and certainly do not shy away from cbetting when you connect (i.e.-do not slowplay ever against calling stations and floaters, you're playing into their hands).