A reasonable suggestion to be sure.
Thank you for your wonderful cooperation with all this. I'm going to call for heavy reinforcements now. 
They're usually pretty expedient about responding. Give them some time though.
We could really use your input and guidance here.
- Manually confirmed http-01 challenge file creation and contents with 100% responsiveness over multiple acquisition attempts (i.e. load balancing not an issue)
- Attempts from Boulder do not appear in apache logs
- Testing against staging environment
- Fails due to timeout after connection
- Firewall suspected but no evidence seen