so you are excluding the "obvious" fake volume not fake volume in general. the exchanges can still continue producing fake volume and if someday your website (or the method in general) became popular they can easily mask it.

in addition to that you are putting too much efford and focus in something that doesn't really matter for sites such as yours that list coins. you are still making the same mistake as coinmarketcap.com and rank coins based on their market capitalization which is a completely meaningless and wrong approach.
not to mention that your site lacks the option to list prices against bitcoin whcih in my opinion is the only thing that matters, you only have USD option.