Sorry for the confustion, I am asking about your security policy setup.
Your MIP security policy should be before your general internet policy on this menu:
Policy > Policies
Trust to Untrust
Also enable logging for the rules so we can see what actions are taken for the traffic on which policy.
Finally, is your general out bound NAT using policy interface NAT or interface mode on bgroup0 interface. If you still have interface mode on, this should be turned off and source NAT added to the advanced tab of the general outbound policy.