I just beat myself in the head for a better part of a day on this… I was using the predefined application template for sharepoint 2013 (which is only available in ASA 9.5 or above.) and getting nowhere. The bookmark would start to open sharepoint then pause. In the end, this command fixed it.
auto-signon allow ip 172.18.6.0 255.255.255.0 auth-type ntlm
Once I did that I went with the default Sharepoint 2013 configuration and everything worked like a champ. Go figure.