Yes, I'd agree with you...remember his pancreas was working hard to make all those green numbers happen...in conjunction with the insulin he was getting his blood glucose was well controlled.
So these blues are telling you that he needs a little help.
Since they are only blues, you may want to consider a fat dose. If you have calipers you can measure it accurately for getting the dose just about half way between 1.75 and 2. Just to see how he responds...he is doing so well lately...I wouldn't want to push him into losing a good dose by passing it by...