Re: 1280x720 refuses to work now
In your log, I see:
(WW) NVIDIA(0): Mode is rejected: Mode (1280 x 720) is too large for DFP
(WW) NVIDIA(0): Native Resolution (Max: 1024 x 768).
You should try adding the ExactModeTimingsDVI driver option, and/or the ModeValidation option. See the driver README for more information. If you need further assistance, please generate and provide an nvidia-bug-report.log.