Uplink Interfaces / Multipath Rules

Running version 9.003

I have 4 VLANS (74 - test, 75 - company 1, 76 - company 2, 77 0 voice)

I have 2 uplink interfaces, both DSL (External 507, External 510)

I have configured uplink balancing with the two interfaces. I set the weight of 507 as 100 and 510 as 0.

I have NAT masquarading on the 4 internal interfaces, each to "uplink interfaces"

I am trying to get VLAN 75 to preference Ext507 and VLAN 76 to preference 510... with either rolling over to the other if/when a external link goes down.

I set a multiplath rule -
Internal 74 -> Any -> Any - Ext 510

And I go to myip.net from this subnet and I see the external IP of Ext 510.

I set a multipath rule -
Internal 76 -> Any -> Any -> Ext 510

But when I go to "myip.net" I still see the ip address for interface 507

What should I look at next?

Am I understanding multipath rules correctly or did I miss a step somewhere?