The offer of the Knifestorm Gatsby on the Stormy Storm Voodoo Juju is rather iffy. What I mean is that you could have possibly used the same exact offer to raise the price of the Stormy Storm Voodoo Juju had it been the focus of your suggestion. That's why I personally don't tend to overly rely on other current unusual prices when pricing another one. Too much relies on bias, perspective, and an assumption that the current price is accurate.

Other than little side-track thought. This suggestion seems rather good, nothing wrong with it as far as I can see. The first trade doesn't seem to be by an active trader since it was bumped two days ago and is only roughly a week old, but he's still selling for lower than your suggested drop which is good since its unclear if it might have had a chance for more offers or even being sold had it been bumped more often.

Originally commented to say outpost was down for a second, but now its back up...this comment is now useless at the moment until I view links.