matsuman wrote on Dec 14^th, 2013 at 10:39pm:

Ok did another test, OPUS fsx is stable on this one, although the speed/alt fluctuation still there when weather is doing an update..which i also see on other add-ons. So far so good........ Kin M. (Klax)

Have you tried to lessen the effects in ASN? It's not as bad if you do that. I had another addon bouncing around a lot using ASN with the standard settings, so I like the idea of ASN, but it can be pretty hard on some other aircraft and not just the CS777. I only have one day left in my trial period, but I'm not 100% sure if I will buy ASN yet. :(