No problem, I will clarify.
You wrote: "Everything is working fine short of I can't figure out how to configure a management IP on EX-3200 (inband, not me0) [...]"
From that sentence I infer that you can indeed manage the SRX and are having trouble reaching the EX switch. Therefore, I ignored the SRX config you've attached, and instead only focused on the EX configuration.
You wrote "PS: Yes I could have the EX to the routing and configure a /30 between the SRX and EX but not sure if that gains me anything."
From that sentence I infer that you are willing to work with a /30 option, but you'd rather have an address on the same LAN.
Looking at the EX configuration you attached, I see that you are, in fact, missing interface L3 interface for the default VLAN.
What I am getting at is that on a Juniper EX switch you use a Routed VLAN Interface (RVI) associated with VLAN to reach the switch itself on a particular VLAN, rather than a loopback interface. That's all. Hence, the commands I included in my previous post are for the EX switch, not for the SRX firewall. Sorry for the mix up.