Using the pvr settings for offset from UTC to -4; apply to all channels for Eastern Standard Time works just fine in Kodi 16.1, however there still seems to be a 1 hour difference when using Kodi 17.3. The Simple Client pvr settings for the same offset don't seem to work. It's perhaps a bit counter intuitive, but what I have found is that rather than using -4, changing that to +1 fixes the problem.

Who'da thunk?

All you have to do after making the change in pvr settings is to go into PVR and Live TV > Guide > Clear data