GTM irule to return differnt pool

I created a test pool wideip. set both pools to use topology in the wideip and the pool.

 

 

This doesn't work, perhaps because some hosts have static routes out but they come back as hitting the external ip which cant reach the mail servers as the firewall wont route from the inside interface to the outside interface in the same dc, so I need an irule to look at if the traffic comes from a specific ip or net and then send it to the appropriate pool(s) which are routeable everywhere.

 

 

so my above example is still the best way to go atm it seems.