Hey Charlie! I have exactly the same problem. Having used the Libra for a while, I found that it is general more than half hour before my Apidra kicks in. his morning I woke with high BG - 10.1- I injected 3units and waited 1.5 hours before eating - I was still at 7 - the Apidra had only just started working. I then ate without injecting any more and will test at 2hours and adjust from there as I think the Apidra injected earlier will cover my breakfast now that it has finally got started. I do find that double-dosing as you're doing lowers my BG too much - the second dose seems to drag me down.
I also find bread and cereal are a nightmare for spikes - the highest spike I ever had was with a small bowl of porridge. I guess we all react differently to insulin, so don't feel like there's some magic formula you don't know about. It's very demoralising when you spike and know your insulin isn't quick enough and everyone tells you it works in 15 minutes as though that's fact and assumes you're carb counting wrong etc. Personally, I just avoid the foods that cause it the most and do my best to manage the timing of the insulin for the rest.
Smidge
I also find bread and cereal are a nightmare for spikes - the highest spike I ever had was with a small bowl of porridge. I guess we all react differently to insulin, so don't feel like there's some magic formula you don't know about. It's very demoralising when you spike and know your insulin isn't quick enough and everyone tells you it works in 15 minutes as though that's fact and assumes you're carb counting wrong etc. Personally, I just avoid the foods that cause it the most and do my best to manage the timing of the insulin for the rest.
Smidge