Thanks for keeping an eye out on the fine details... I occasionally mess up on those... (copy & paste) is not always helpful for me :)
The sizes I list are the base sizes... which does make the wisps look a little odd since the mini's themselves are the same radius as a medium base.
Thanks for reminding me about the other 2 minis... they have been on my "to do" list for awhile. I'm not sure if it is just me but my Shadowfire Elemental is much different in color than the one I got with the Emerald Spire set. The ES one is made from a translucent purple plastic, where-as the one I bought recently from Paizo appears to be black plastic. (I actually just held it up now to the light of my monitor and I do now realize that it is technically made from a translucent purple plastic, but it is far more opaque.)
Yeah, looks like I was thrown off by base size vs mini size. Sorry about that.
I didn't notice the color difference so much on the Shadowfire Elemental (I need a better light source) but I could definitely see the difference in the paint app. The lava lurker seems to be more opaque the Emerald Spire one as well.