Looking for some configuration guidance

Hi folks,
Currently running v9.105-9.

I have 2 ISPs. One has an sixxs tunnel and the other uses native IPV6

I have 2 VLANs. Completely different IPV4 and IPV6 address ranges

I would like 1 vlan to go to one ISP
and the other vlan to go to the other ISP.

I can get this working if I don't use the http proxy on the second connection.
How can I split the proxy traffic across both ISPs based on source? Each network has its own http profile.Yes, I am aware the aim of a proxy is to mask the original address.

Thank you

Ian:):):)

Forgot how do I setup the IPv4 network object and an IPv6 network object for the same network so that the IPv6 traffic is not nat'ed on the second link? I have tried but the process doesn't seem to work, the object was not seen as an interface object.