She's high at PMPS because you skipped the AM shot, so there's been no insulin working to help break the food down into the nutrients that Chi Chi's body can use.
Since you skipped the AM shot, the "count" starts over again, so you'll need to go back to 2 units and the count starts over with tonight's PMPS test. Keep giving him the same 2 unit dose every 12 hours until he's been on it a full 6 cycles without any changes in dose. IF he happens to go below 50 during any cycle, that's an automatic reduction of .25 unit.
IF AT ALL POSSIBLE, it'll be a big help if you can get some PM testing in...even just one "before bed" test will help, as well as tell you if it might be a good idea to set an alarm for later in the night to grab another test. Most cats go lower at night, so we need to see where he's going
IF you get a preshot number that you're concerned about, you have these options...You can stall, don't feed, and recheck in 30 minutes. If the numbers go up on the next test, it's probably safe to go ahead and shoot. I've even shot a 55 one night, but I have a lot of testing experience and I know how China's patterns are now.
You can give a reduced dose if that makes you feel better too as well as leaving some higher carb food down for him to eat if his numbers start to drop.
If you get a low Preshot that you need help with, make your Subject line say something like "Chi Chi AMBG 108 STALLING,PLEASE HELP"..Hopefully someone will be online to help
Good luck to you and Chi Chi!!