Rue - sorry to hear about the loss of two of your triplets last time. Very hard thing to deal with.
As for you 'taking your eye of the ball' I think as has been said above you are probably doing a better job than the majority of people with diabetes so don't beat yourself up. However, you do need to try to get back into the swing of testing. I tend to find I don't test when I feel I've been 'bad' and I just don't want to see the results! But it is a bad habit, because a) it means that you can't fix things if they are going slightly awry; and b) you're running the risk of losing hypo awareness if you're not picking up on them. I don't need to tell you this, do I? So, perhaps take it one step at a time. Add one more test around midday - possibly before lunch? That way you're breaking up the day with just one test, and it is easy to remember to do it then. You'll probably find you're BGs are fine and it might incentivise you to get back up to the one squillion tests a day my fingers are currently not enjoying 
puds - re splitting long acting. Be warned it only really works with Levermir, not Lantus. Lantus has a much longer profile and so splitting hte dose means you get unhelpful overlaps. I moved from Lantus to Levemir and started to split because my morning readings began to get worse and worse but I found that if I was increasing the Lantus too much I would be fine first thing but madly hypo-ing mid-morning and lunchtime. So, I split mine because generally speaking I need WAAAAAY more insulin overnight than I do in the day. I think that is quite common and can relate to dawn phenomenon. So, pre-preg I was taking 7u in the morning and - I think - 19 at night.
When you first split the dose, I think the done thing is just to split it evenly (50/50 as you describe) and take it from there, tweaking if you feel the need to have more at a particular time of day.
Did anyone watch One Born Every Minute this week? I watched it on catch up last night. There was a lady being induced due to Gestational Diabetes. She and her husband were asking whether she had to be induced or could they wait for labour to start naturally. The doctor was very kind but explained 'the small, but significant risk of sudden death of the baby' and also said that they have no real knowledge about why it happens. I don't think I've heard it put so bluntly before - explanations I've had range from deterioration of placenta to size of baby. Anyway, not new news, but it was quite interesting to see the induction (she had all the drugs going in the end including epidural and had a forceps delivery in the end).