Kindle Graphics Issues

[Scuba]

I’m new to publishing e-books but took the plunge with Kindle 3 having created several paper books.

My method: Create HTML in Crimson Editor – convert using Kindlegen – test in Kindle Previewer on PC – then test on my Kindle 3 – upload to kindle store – download sample pages.

With a distant background in software, this seemed the best way to keep things simple and have complete control the look of the books.

All seemed great. I can create books with TOC, navigation, graphics, hyperlinks etc. They look great in Kindle Previewer and great downloaded direct to my Kindle 3 but after uploading and downloading from Kindle store the formatting of graphics is a disaster with all being scaled up to maximum size.

The book relies on using small ‘thumbnail’ graphics used in combination that sit next to each other perfectly on the screen. On Previewer and direct to Kindle they work perfectly so what is the store process doing?

Am I uploading the wrong way?
Is there a way to tell the store that I’ve designed the book and it doesn’t need to do anything?

I’ve seen lots of references to similar problems, but the explanations seem tied up to other specific tools that I’m not using.

Hope the question isn’t too dumb.