although hypo is always a risk, I wouldn't worry about it much at these levels of insulin and #s that are no where close to low
although it's usually recommended to start with a no-shoot of 200, the idea is to collect data as you give shots at PSs around that level, and once you are comfortable with what a dose does at 200, you lower your no-shoot to 180, collect more data, and then lower it to 150
in my experience the difference needed in dose between lower PSs and higher ones is slight, although ECID - with Bix I was really nervous about low PSs and so did the dose lowering thing when I'd get a lower PS, then his #s would go higher so next time I'd try a dose a little closer to my regular dose, #s would go high again, repeat, repeat, til finally I ended up just shooting his normal dose on the lower PSs and that turned out to be what he needed - no dose change really between the higher PSs and lower ones.
But ECID, and it's good to shoot what you are comfortable with and gather data to be sure you are shooting something safe. If nothing else, it will help you sleep at night vs. shooting the full unit on a 150 and then feeling compelled to stay up and test every hour til you are past nadir. ;-)
So anyhow, the no-shoot of 200 is designed to give you a buffer zone til you have more data, rather than being a number where you are at much risk of increased hypo giving a full dose at that level. If either of you were on doses like 5u it might all be a little more worrisome, but I think hypo is fairly unlikely on 1u with any PS above 150, with a cat that clearly needs insulin. But still good to collect data and know what you are dealing with.
A spot check at bedtime if you are at all worried is always a good idea - if you are ever seeing #s around 100 and it's only something like +2 hours since the shot (and that's not the # you were expecting that early in the cycle), then you might want to offer food and stay up and test every 1/2 hour or hour to be sure things aren't headed too low. If you see a number like that at more like +4 it's probably a "YAY!" moment.