I think you touched the right dimensions in your answer.
The answer should revolve around in the context of:
- US-India Nuclear Agreement 2005 - shifting the strategic balance in India's favor.
- US efforts to include India in NSG - Pakistan's point of view is that it should be criteria-based instead of merit-based
- Main determinant of US strategic inclination towards India is to counterweight China through balance of power in Asia
- The international pressure on Pakistan to reduce its fissile material which reflects duplicity as India has already amassed vast fissile material.
- Pressure on Pakistan to get rid of tactical weapons, given India's cold doctrine poses existential threat to Pakistan.
- US as mediator in case of escalation between Pakistan and India.