Hey nadja,
Your cycles look pretty nice, those reds are so barely red, no black or hi readings-I would expect the pmps to come down once Sam gets used to the blue, they are bounces but the look to be very very small bounces. Right now the 1u looks really good.
What would be great for both you and your vet is if you would start taking the +6 reading at night...even if it's +5 or +7, whatever works for you. Knowing whether Sam has a flat cycle in the PM or has a good curve is important as it lets you know how bouncy he is at this point. The reduction to .5 may have cleared his system out and you may be getting good cycles at night too, which would be awesome!
How is the food transition going? Remember that if he suddenly starts eating more raw you need to watch his numbers more closely, he almost went green yesterday and with less carbs his numbers will probably be lower.