Your config will not work. Not sure exactly what you needs are but Routing-Instances MUST include interfaces, at a minimum, if you want traffic to work within a routing-instance. I believe instance-type forwarding would be L2, and it appears you want L3, so your instance-type should be virtual-router (VRF type).
For additional info check out the links below:
http://aconaway.com/2012/10/31/junos-basics-routing-instances/
https://www.juniper.net/documentation/en_US/junos/topics/concept/routing-instances-overview.html