Try to add another channels from the same source (ini fail).Some times the EPG is cached somewhere in your system. If you're using Kodi TVH Client, just clear data cache before testing. System => TV => Clear data and cache. Also after Webgrab is done with your xml file don't forget to restart TVHeadend.
Try to check EIT Time offset as well.
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Another try!
1.Use the ini fail with - 0500 time zone.
2.Leave EIT time offset unchecked(as it was)
3.Use mediaportal.xml file instead guide or guid_wgp
May be TVHeadend doesn't read - 0500 correct.
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