Most cats on a low carb canned diet do not need more than 1u of insulin. You cannot dose based of fructsosamine tests because that would have included the period before the diet change, and 1.5 could have been too high to begin with on the low carb diet.
Does Geordi have any history of ketones? Are you testing for them?
A 44 is an automatic dose decrease according to the dosing protocol, so you should definitely lower the dose. A normal dose decrease is .25u. Because he did not arrive at the 2u safely, and you were not testing at 1.5u (which may also have been too much insulin), I would go back down to 1u or 1.5u. Personally, I think starting over at 1u and using the dosing protocol to manage his blood sugar from there is your best course of action, as long as there are no ketones in the picture. Most cats on a low carb wet diet do not need much more than 1u. That's why we alter the dose in .25u. Cats are much smaller than people or dogs so they need much smaller doses/dose adjustments. Here's a link to the Lantus dosing protocol:
http://felinediabetes.com/FDMB/viewtopic.php?f=9&t=1581
If he is still low before shot time, please post over at the Lantus forum for advice before giving insulin. We usually recommend that new people don't shoot insulin on a low preshot until they have the data to support the decision, but they may recommend that you shoot a token dose of .5u or .75u to keep the shed (subcutaneous insulin depot) from depleting completely.
There are people in the Lantus forum who have a ton of experience with this insulin and give excellent dosing advice. I would urge you set up a spreadsheet and post over there for advice. Here's the instructions:
http://felinediabetes.com/FDMB/viewtopic.php?f=6&t=18207&start=0
If for some reason the template doesn't work (it's been problematic lately), use this workaround:
http://felinediabetes.com/FDMB/viewtopic.php?f=6&t=50130
Finally, don't be surprised to see his blood glucose rise high tonight. When cats experience a hypoglycemic incident, their liver releases glucose into the bloodstream and boosts their numbers high. This will clear eventually, but could take several days--which is why it is important to hold doses for at least 3 days before increasing the dose.