Sorry your feeling down at the moment. I absolutely understand where your coming from (but obviously from a parent perspective) and it does seem that sometimes no matter how hard you try you just cant get on top of things can you? What I have learnt is to deal with things in tiny bits, so if there are random high's without a pattern for example I dont tend to worry about them and just keep correcting, however if you look back you can often see that there is a pattern emerging and then focus on it.
I start by sorting out the basals into 4 hour sections and checking if they are correct, then i move on to meal ratios etc. I was trying to do the whole 24 hours in one go and failing miserably!
Perhaps you could start in the next few days with sorting out say the waking level and altering things for a few days and once you have that sorted - move on to mid-morning level and so on....
Your not doing anything wrong - the numbers are just an indication that something needs tweaking - so dont feel guilty at all - just take the bull by the horns and show it what your made of!🙂Bev