"As I was reviewing your account I noticed that your daily budget is lower than the recommended amount; therefore to stay within your set budget, [u]Google is not showing your ad every time searches are run on your keywords. We spread the delivery of your ad throughout the day to make sure you do not accrue all of your clicks in the morning.[/u]
When your daily budget is lower than the recommended amount, we list the recommended daily budget next to your current daily budget. If you view your campaign setting, you will see that the recommended daily budget for full coverage of your campaign is $2,690. If you set your daily budget to this value, or raise it an amount you are comfortable setting as a daily budget, you will maximize your ad's visibility. "
Still, Google is the number 1 search engine in the world, so one assumes an ad there is worth the cost to put it there. But if you do not have a way to track conversion and revenue gained by each click ...... who knows what you get for the dollar invested? Google does not offer an ad analyzer and FindWhat now does. So watch and wait is probably the best advice, unless you can track the clicks and conversions you get from AdWords.
Findwhat: I am not impressed at all. The conversions I see with Findwhat dollar for dollar compared with Google are almost null. I am also very suspicious of some their link partners ethics.
For example, in one of my keyword grouping, they recommend a $40/day budget. Since I make no profit off my web site, this is all coming out of pocket, and that's just insane, but I want to keep it up because I get an 11% click-through rate on it. So I set it to $10/day (which is still high, but it's a current event sensitive keyword). I've had everything ranging from $4 days to nearly $11 days since I set that limit.
The problem has to be linked to the fact that the AdWords reports aren't kept up-to-the-second accurate. I would guess that this is related to having to run on multiple data centers, and coordination between them being tricky.
However, it sounds like the real problem in your case may be a too general key phrase. $300 per day is pretty hefty already. You may want to consider breaking it into smaller, more targeted key phrases. In my experience, this generates substantially better CTR, anyways.