As you told us, we don't have any explanation, how everything works, we added a section to our FAQ, where everything is explained.
You didn't actually explained how mixing works in FAQ page of your website, all that you said is that you have 67 bitcoins in reserve and that all process is fully automatic and tested very well.
I don't know who tested it and I didn't see any independent review so far.
According to cloudflare: We use Cloudflare, because we want our customers to always have a good expierience on our website and always have a fast loading webite, if they visit us. Cloudflare also provides a good DDOS protection. We don't want downtimes because others perform DDOS attacks to us.
I understand you want to use cloudflare to prevent DDOS attacks, but all traffic, address and transactions are compromised in this way, and US government agencies will have all this data available.