Clustering and Performance for .NET Application

We have a .NET 4.0 32 bit application that is running on SQL Server 2008 R2 and Windows Server 2008 R2, however we do NOT have the source code, the application is in its fully compiled state so we cannot fix the code or change the table structure. Index tuning has already been performed but I want someone who can get two IIS instances running on the same machine sharing session state on two different IPs and two different application pools and web gardens and is available to work with me to get a dramatic performance improvement through that as well as any other thoughts or methods they can think of. Tell me what your experience is and if you would be available to work via GoToMeeting with me on weekdays starting immediately, I am in Central Time and would like to define a schedule early on that we can stick to each weekday. This opportunity could be quite a few hours, please let me know how many hours you would be available.