Just would like to point out that it's very difficult to base the dose of a new insulin on the dose of the old insulin when there was virtually no regulation on any dose of the old insulin. Poor Munchie was all over the board on doses from 1U to 2U of Lantus.
While I agree that it's probably already time to go to 1U on Levemir, timing can be everything with Levemir. Not waiting long enough on a particular dose compounds the bouncing. Elizabeth has done a good job with holding doses on Lantus, but poor Munchie bounces hard. One of the keys to leveling out those bounces on Levemir is to stay the course with one particular dose for
at least 5 days. Of course one should also consider the cat's history and a DKA survivor warrants perhaps more aggressive dosing, but surpassing the optimum dose won't help matters either.
Last year Munchie had lows that caused definite rebounds on 1.5U of Lantus and even 1.25U (early Sept.). Even her first day on Levemir at 1U produced a result which wasn't half bad. Going to 1U and holding it should give better results than jumping to 2U just because that was the last Lantus dose. And since we are seeing more cats switching to Levemir because of problems stabilizing on Lantus, basing the Levemir dose off the Lantus dose may be unreliable, for exactly the reasons I stated above - no regulation established on Lantus, (hence the owner's desire to switch) therefore no best Lantus dose upon which to base the Levemir starting dose.
Elizabeth, I am afraid that Munchie's other issues may make it more difficult to establish a good dose on any insulin. It would be worth diagnosing pancreatitis via the fPLI test and an ultrasound would be very helpful to determine if the liver and bowels are involved with the inflation, which could indicate Triaditis, as Pamela mentioned. Here's a good article on Pancreatitis and Triaditis with a lot of links to help understand the complicated relationship between the organs involved.
http://www.harpsie.com/pancreatitis.htm
One more
http://www.ibdkitties.net/pancreatitis.html
Hope that helps give you some options. Hang in there!