Only 1 Pool Member Can Ping Out At Any One Time

I have resolved the u/m issue. Now both members can ping to server A at the same time. I changed a setting in the local F5 configuration for my ip forwarding virtual server under client profile. I changed it from route_friendly_fastL4 to fastL4 for my ip forwarding virtual server between skip and external interface. Am still looking at what is the difference between the 2 settings... but if anyone knows pls let me know.