As long as he is acting ok-ish, no need to panic!!! The keys things are to look out for crisis stuff - hypo, ketones, DKA, not eating, clearly doing really poorly, etc. If they are moderately doing ok, there is room to try things & figure out what to do.
The problem with random high #s like this is you just don't know where it came from or what it means w/o some mid-cycle data to clue you in. The dose might be too high, the dose might be too low, it could be just right but he hit greens and is having some liver training action.
One rule of thumb is that you don't raise on the 1st high #, but you do lower on the 1st low #. So if you ever get a number under 50, PS under 150, or number that is too low for where it is in the cycle (say a 90 at +2), you lower immediately on the next shot. But one high PS, you don't raise, you wait and see if it is a trend, or a wonky.
Since right now things are kind of in "detective" mode, I would try to get a mid-cycle number in the nadir range (maybe +4 to +7, somewhere in there, whatever you can get on any given day) as many cycles as you can. Maybe a bedtime check at night. That will help give you a clue and know what to decide. (I know... crazy number on the 1 day you can't get in a spot test! ohmygod_smile )
Like others have said, if you can sort of prove what dose is either too low or too high, that helps you not have quite as much guesswork. There are some risks to going back to 1u (be sure to test daily for ketones if you do that), but if the #s go higher, then you know that dose is too low, and then you only have one direction to go in rather than general confusion on days like today - great #s yesterday, woohoo, then wth? today :? But... could have been a great day and a green nadir, or could have been totally blah, there's just no way to know for sure.