Ideally the 2hr after meal level should be no more than 2 mmol higher than the before meal level. Metformin probably won't have much, if any, effect on spikes. It's effects are more subtle and "background" than that, I'm afraid.I thought 14 was too high. I know 5 is normal and we want to try keep under 8 but how much fluctuation is too much? I'm assuming it will go up and down. Metformin should help prevent spikes tho.
Those links are really useful thank you.