Let's see if I can tackle those questions one by one.
You are correct, we cannot help you with whatever dosing method you are currently using as we have no familiarity with it. In addition, there are almost no night time tests. Cat usually go lower at night and we dose based on lows (not preshots), so we'd be just guessing how low he's going and where his dose should go. You say you cannot shoot 70 units when he is low, what do you define as "low"? Assuming you start with a lower dose than 70, how low would you feel comfortable shooting him his full dose? Remember, with the Levemir depot, the cycle will play out a lot like if you had shot the full dose, unless you do a greatly reduced dose.
What makes you say that? What signs are you seeing? Does he always have food available to stay safe?
When a cat's dose is reduced down to zero units, following reduction guidelines in a dosing methodology, and then goes 14 days in normal numbers, then we consider it to be in remission. Raymond James looks like he's a long ways away yet.
Why would you stop insulin? It looks like he still needs a large dose, though it's really hard to say what that dose is.
Is there any way you could follow a dosing methodology we use here? Such as the Start Low Go Slow dosing method? That would mean keeping the same dose, regardless of preshot value, unless you see him go below 90, in which case you'd reduce the dose. If so, I'd pick a dose and stick with it, until you see him earn a dose reduction by going under 90. I'd be guessing what that starting dose is, but I think it's lower than 60. Maybe 50? I'd just have to try it and see how it goes.