Please accept my apologies. After a lot of investigation yesterday evening I actually found out that the SRX deals with A/A and A/P in a different way from my usual understanding from a Cisco perspective.
It looks like the Data-Plane, even in an A/P still acts, or seems to, like an A/A..... It appears that the Control Plane, even in an A/A configuration is actually running as Active/Passive and only the Data-Plane is A/A.... this actually makes a lot of sense as we don't really care about the Control-Plane because that is the Chassis, but we DO care about the RTO (Fabric and Data-Plane).... I will confirm this today by running "show chassis cluster information" ...... Not sure how to upload a diagram but I have been tasked with building a NEW ISP Network in the following configuration (across 2 sites):
SRX1500
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CE ---> PE1 (LNS1) ---------------- PE3 (core1) --------- Transit (CE)
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CE ---> PE2 (LNS2) ---------------- PE4 (Core2) -------- Transit (CE)
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SRX1500
No problem with the core.... typical IS-IS, MPLS, BGP .......