Building on bsc's observations above, your rise at 2 hours may well have been due to the glucose from protein hitting your blood stream. I't takes some time for this conversion to take place, hence the 2 hr.lag. Many people find they have to account for this when they go low carb. There is a group here called TAGers United (TAG stands for Total Available Glucose) which discusses techniques for taking this into account and thus improving your control.
