converting pdf files to Kindle

I publish books and need someone to convert our final pdf files to a format that will look good in amazon's Kindle. The attached file will give you an idea of what you'll be working with, but our average file is a lot bigger and has a lot more photos. We can give you 4 projects per month to do for $50 each, regardless of size. The work will be continuous, and you can count on 1 project per week for at least a year, if things work out. If things work out, we can continue for as long as you want to do the work. My main concern is that it looks good in the Kindle reader. We've been uploading pdf files like the attached to amazon's Kindle program for months now, and they look about 80% good. But lately Kindle has been telling us they need to look better. Let's start with 1 project for $50 and see how it goes from there. I'll send the pdf you'll do to the winner. Thanks.