Cisco Firewall :: Replaced A PIX 515E With A Pair Of ASA 5520

A few weeks ago, I replaced a PIX 515E with a pair of ASA 5520's. We have a few basic web applications behind the ASA's.   Nothing complex;  just port 80/443 traffic. During the swap, we basically just copied the config from the PIX to the ASA. So the config is virtually identical.
 
Since the swap, we have one small set of users who gets timed out when trying to get to the application. This small set of users are scattered across the state of Alaska, and they are all accessing the Internet via a satellite connection. All other users across North America can access the application just fine.  
 
Since the satellite connections are relatively slow, but they worked fine when going through the PIX, I suspect the issue is a difference in the default TTL (or similar parameter) between the PIX and the ASA.