I actually just talked to Carlisle this past Fri, and as I had posted in a different thread (maybe you missed it), the RH tires, 15" are now rated at 81mph due to a govt tarriff placed on imported 15" tires with an 87mph. So they changed the rating of the 15". The 16" are rated at 75mph, and if I remember right, the 14" are 87mph, but not sure if they were changed due to the tarriff like the 15".
Great catch on the tires! That could have been bad.
Hope the Maxis work well for you. I have considered them myself in the past, just have never pulled the trigger on a set yet.