Hiya Denise!
I'm going to take a stab at this, and I am hoping that the good people who've been advising so far will make corrections to anything I say that isn't quite right, but here's my take on Shakes since you switched.
If I look back on his SS, it looks to me like the doses you were at the last time that Shakes really showed decent mid-cycle numbers on Prozinc were in the range of 3.5 to 4.0 units. I know that we thought at that time that he was bouncing a lot from the blues and occasional greens, so the consensus was for you to reduce the dose to make the bouncing go away. But as you reduced the dose, although some of the preshots were lower, he didn't get much of a "kick" from the lower doses during the cycles.
So, when you switched, you started at 1u, and that was somewhat based upon what your latest doses of Prozinc had been. But they weren't his last "good doses" of Prozinc. Just before you switched, Prozinc wasn't doing all that much for him on the lowered doses.
So, I think you probably started too low on Lev. Since then, you've followed the protocol, leaving the dose the same for a few days, then upped in logical increments just like you're supposed too. Still no great results, but you're doing what you are supposed to do. Shakes just hasn't reached his "breakthrough dose" yet. But he will.
In another thread, there has been discussion of a logical starting dose when switching from one insulin to another, and the figure I have seen is that the starting dose should be around 70% of what he had been getting.
Well, my theory with Shakes is that since the last "good" dose he seemed to have on Prozinc was in the 3.5 to 4.0 range, then 70% of that would put him in the 2.5 to 3.0 u range on Lev? So what I'm thinking is that you could be close to his "breakthrough dose" soon.
My other theory involves "patience pants". From what I have seen with the "L" insulins, it seems that the beans need to wear larger pairs of patience pants. (Not "larger" really so don't take that to mean anything, ladies! :lol

. What I mean is that with the L's, whether you are following the TR or the SLGS protocol, you need to "wait" longer than you do with a P insulin -
First you have the "shed" to consider, and waiting for it to be established.
Then you have generally a longer time frame for a dose to "settle".
Then the protocol states that you should wait for "X" number of days before making a dose adjustment.
Bounces can take longer to clear with L's than with P's.
So, it really requires that you be more patient, as hard as that is for you or anyone to do. Dose adjustments don't show results quickly like they often do with Prozinc. But that's why there are protocols to serve as guidelines for dosing. To me, that's the "bright side" in this. The protocols lay out the steps for you. Wait X days, and increase by X amount based on the data you collect. In a way, it is "easier" in the long run, because you don't have to spend as much time 2nd guessing your decisions. In a way, I think that
is easier.
Bottom line, I think Shakes will eventually show improvement, but at a higher dose than he's been on so far. The hard part, for you, is being patient until that happens. But I think it will happen! So, "patience grasshopper"...
Carl