I need an irule for a "VIP that forwards ANY to a pool that is going to a default gateway".

That is what I have configured. The Virtual Server is FastL4 and it is working for traffic that should go to the gateway configured as the Main Pool. However, for the iRule, the intent is that for traffic that matches the iRule to be sent to a different Gateway that is listed as another pool in the iRule. For normal traffic to the Virtual Server is working. For traffic that matches the iRule criteria, that tarfffic is still going to the gateway configured in the Main Pool instead of getting sent to the Pool and the different Gateway configured in the iRule.