New F5 Configuration

Study wise have you checked out F5 University (university.f5.com) - although this maybe the getting started videos you mention. Askf5 has other resources too, like implementation and concepts guides. Again these should help.

Bit tricky to fully diagnose your issue, however, is it a routing issue with the servers talking back to the windows client, rather than back through the bigip? Try a packet capture on any or all of the devices to confirm. If you want to try and get a quick win then perhaps try using SNAT Automap on the Virtual Server configuration - this will source NAT the traffic to the BIG-IP self IP.

Hope this helps,

N