I was actually going to add redundant links between the SRX and ISP managed router for a full mesh setup.
Each firewall can easily handle the full traffic load. What I am trying to achieve is load balancing between the firewalls and failover while having both firewalls passing traffic. If one goes down, nothing happens. No need to fail anything over. Just those routes go away.
Each SRX will have a connection to each network. Right now the layout is like it is in post 1, but the below diagram is what it will be like at the end of this week.
+---------+ +---------+
| ISP | | ISP |
+---+-----+ +---+----+
| \ / |
| \ / |
| / \ |
| / \ |
| / \ |
+---+----+ +---+-----+
| SRX | | SRX |
+---+----+ +----+----+
| |
| |
| |
| |
| +--------+ |
+---+ QFX +--+
+--------+