one thing i did notice in the log is that both pool members were being used, see below: (these are consecutive lines)
and in the 5th entry shown, LB::server is blank
Aug 30 15:32:14 local/tmm1 info tmm1[13658]: Rule persist_prod : persist_node is 10.10.11.252 and server pool is p_HTTPS
Aug 30 15:32:14 local/tmm1 info tmm1[13658]: Rule persist_prod : cookie value set to 10.10.11.253
Aug 30 15:32:14 local/tmm1 info tmm1[13658]: Rule persist_prod : cookie value set to 10.10.11.253
Aug 30 15:32:14 local/tmm1 info tmm1[13658]: Rule persist_prod : cookie value set to 10.10.11.252
Aug 30 15:32:15 local/tmm1 info tmm1[13658]: Rule persist_prod : persist_node is 10.10.11.252 and server pool is
Aug 30 15:32:15 local/tmm1 err tmm1[13658]: 01220001:3: TCL error: persist_prod - no such pool Failed Tcl_pool_GetFromObj: pool (line 1) invoked from within "active_members -list $current_pool"