Annemarie,
You manage as best as you can, and that's all any of us can do. I tested Bob before every single shot. Other than that, I tested when I could. If I happened to be working a shift where I could stop by the house (I work on an island and I am never more than 3 miles from home) to test him during the day, I did. Or I'd test him once in the evening before I went to bed. He was on insulin for 10 weeks. I tested him more than 3 times a day perhaps once every two weeks. It was all I could do, and it sufficed.
There isn't a direct correlation between how many times you test per day, and how likely regulation or remission is. Testing provides data, and it provides safety and reassurance that the dose is not too high or too low. It doesn't guarantee success or results.
I believe that your dose could be increased. I am probably the most aggressive person who posts here regularly as far as "dose" goes. That doesn't mean I'm right or anybody else is right. What makes me hesitate to give advice is that your kitty is not my kitty. So what I will tell you is that if you choose to increase the dose, it should be on a day when you can be around to test in between shots. Like a weekend, or on a night where you don't have to worry about getting up the next day early. If you increase, you would want to be able to test at +4, +6 and +8 so that you can catch the "low point" as see what it is. You have to be able to know how to deal with lower numbers than you are expecting to see, just in case they do drop into the 40-50 range. That can be scary the first time or two that you see that big "50" on the meter display, especially if it happens before the normal nadir time.
I personally feel that you could up the dose to 1.5 without any problem, but I won't advise you to do that unless you can test during the cycle and be able to bring up his BG if you need to intervene.
What it really comes down to is that you hold the needle, and it is always "your call" no matter what anyone advises. The best thing to do is to read a lot, ask a lot of questions, and be prepared no matter what you decide.
Carl