TCP Out-of-order, TCP Dup ACK, and TCP Retransmission packets are displayed.

if havent, you can try disable ACK on PUSH which is default to Enabled.
https://my.f5.com/manage/s/article/K29377715#datatransfer

when enabled, vserver will wait for server response for Acknowledging client's TCP PUSH (which contained client request payload).
if server response time is slow, clients will do retransmissions.

you will have to solve the failed monitor separately.
it is better to consult with application team to set proper health monitor.