Dude yes, the CGM is such a wake up call. I was doing basically the same thing, banana, berries, spinach, oat milk, and I was hitting like 150 after breakfast and then crashing hard by 10am. Added a scoop of vanilla whey and a big spoon of peanut butter and mine dropped to right around 115, pretty much the same as yours. The weird part is I actually stay full till lunch now too, which I did not expect at all.

Man, who cares. A 1920s poetry book that was already falling apart got another few decades of life out of it for the cost of a glue bottle. That conservator is worried about a book that might outlive us both, but PVA has been holding paper together since the 50s and plenty of those joints are still fine. Reversible matters when the book is worth real money or you might need to undo the work later. For a beat up reader copy, hold beats fancy every time.