This Article explains how to change the load balancing factor setting in Strategy Web. To understand the effects of modifying this change please refer to the following:
KB4759 : Strategy Intelligence Server cluster load balancing FAQ
This setting can be modified from the Strategy Web Administrator page "Load Balancing Factor" under the Server Properties. Note that it doesn't require to do a re-start of Web Application Server or Web Server

After modifying the setting any new connections made from a client to Strategy Web that require generate a new session with the Intelligence Server will make use of the new parameter.