I also am a slow loser. I started in Jan. 2013 (with some regain at the holidays!) and have lost about 30 pounds now. It's actually coming off quite a bit faster now, which is nice, but I still have to remind myself that I won't be at my goal weight in a week or a month or even a year. And that is okay. I really hope the old adage that the slower it comes off, the easier it is to maintain, is true. And I think that gives my body and mind more time to adjust.
Good for you, 5 pounds a month is great! I hope you can learn to see that and keep going. I wouldn't change anything about how much you're eating since it's obviously working, unless you really feel the need to increase your rate of loss.