Hmmm. I think a breakthrough should be soon-ish. I'd probably try 1.6 again tonight, and if no progress by morning you could go to 1.8, or if you wanted to try a BAM dose (only recommended if you are home to monitor) you could try 2u and see if you get a breakthrough. If that works you might back off to 1.8 on the next shot (depending on how the #s look). Sometimes they need a little extra insulin to get back to good #s, it's like a glass floor the way I picture it.