Interface security levels are only relevant if no ACL is assigned to the interface.
When you say you are unable to pass traffic are we talking about ICMP traffic or http, https traffic also? If it is just ICMP then you will need to enable ICMP inspection. Enter the following and test again:
policy-map global_policy
class inspection_default
inspect icmp
Is the outside interface connected towards ISP with public interface? If, yes then you will need a NAT statement unless the subnet on the PDS interface is a public IP also.
Run a packet tracer and see where the traffic drops, where x.x.x.x is an IP on the PDS network and y.y.y.y is an IP on the outside network:
packet-tracer input PDS tcp x.x.x.x 12345 y.y.y.y 80 detail
You mention that you have opened for IP in both directions so this should work, or at the very least give us an indication where the packet is being dropped.
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