Well I can certainly shed light on the matter, but your stated commitment to your hypothesis might make the effort of little value.

You are making associations based upon glucose levels without knowing the actual value of your glucose at such intervals. You have no way of knowing that your glucose levels are contributory to the nature of your palpitation events, but merely a cause-and-effect theory.

An equally plausible scenario which is far more likely is that GI symptoms are quite prevalent in individuals during the afternoon prior to the evening meal and for those that work, increased acid from stress and activity produce changes in the gut which are very easily capable of inducing palpitation events. The subsequent consumption of the evening meal very commonly suppresses the common symptoms of an empty stomach and along with it, relieves the common characteristics which induce vagus nerve-induced palpitation events. It is also of note that posture can have a great influence upon the GI tract during this period as well.

I seriously doubt that glucose has any reference to your difficulties and you can certainly test your theory by investing in an inexpensive glucose meter to perform a basis test and analysis. Realize that your baseline glucose during that time of the day can be anywhere from 80 or so to 90 and two hours following the meal should be around 104 in normal young adults. Any mild change in these values, however, would constitute variable ranges of normal.

Best regards and Good Health