Robster65
I was in a 'post conversation' the other day on a different forum about the absolutely critical nature of getting your basal right.
For many MANY years I pretty much left my basal alone and was constantly furstrated by 'errant' and 'inexplicable' readings during the day with no seeming pattern or explanation.
Since Feb this year I've been paying a lot attention to my control generally (and like you have begun to take lots of notes/readings, which is the first time in years I have bothered to do so).
My experience over recent months convinces me that the importance of your basal level cannot be underestimated, and that it is not necessarily going to be fixed. My own requirements have changed both up and down by a unit or two over the months.
If my basal level is wrong (even slightly) then I haven't a hope of getting boluses right - especially with all the other factors that can affect bgs (level of activity, food fat content, weather conditions/temperature, the ole 'liver mucking about' etc etc). If my basal is off by one unit I can find myself banging in 4-6 units of correction bolus with little or no apparent effect. Conversely a little too much basal can mean 'normal' insulin:carb ratios send me relentlessly low all day.
Like you I'm on Lantus, and as you probably know the 'flat 24 hour profile' is a wildly optimistic view of how the stuff actually works. I am also aware (after quite a bit of testing) that my basal requirement is not consistent over a 24hr period either - I seem to need less overnight and have begun taking Lantus at breakfast to that the tail-off in activity matches my reduced requirement.
Have you ever tested your basal dose? If it's not able to keep your bgs stable over a morning/afternoon/evening (test one at a time!) where you are not eating and not bolusing, it may be the part of the enigma...
Mike