Hi,
I like a spike to be no greater than 2 points above my pre meal reading.
With regard to the timing, there have been several threads discussing this and some people test after finishing their meal. If it suits you to test 2hrs 20 minutes after to catch the spike then I would carry on.
I spoke to a Professor in the diabetes field and he reckoned the highest would be at 90 minutes, some here say 75 minutes so who can we follow?
Do what is right for you.