Change persistence from Cookies to Source_Address

From my perspective it´s not possible to apply an additional iRule to overrule the decission matrix in your existing iRule. Very likely changes to your current iRule need to be done as well.

 

That´s why it would probably be the easier approach to create a copy of your current iRule, strip off the persistency related functions and to apply it to the relevant virtual servers along with a source IP persistence profile.