Are you a facebook fan page admin and your posts get lost in the mix? Do your posts stay in the "Top News" feed on the home page?
Here's a tip, post when the traffic is high, usually people are infront of their computers during the evening. So I suggest you post twice one during the day and once during the evening.
Another thing is; have you considered the different time zones of your fans? check your fan page's insights and allocate posts according to the different time zones.
Moe Kamal, Jr.