Yes, finding how to correct such levels is a BIG problem. Unfortunately when you try to be conservative and just take a small dose of insulin to correct, then add more with another shot later they may combine and drive you low before the first shot finishes it's activity.
Also note that several other factors come into play with such bouncing bg levels. Best thing I can say is to take it slowly and work your levels down over several days or week(s) 1 step at a time. Among other things your body needs to fell comfortable with a new lower level which takes 3 or more days each time. You may need to stretch it out longer for it to be most effective. This will give you improving levels, but trying to force it down in a few hours is highly perilous, as I'm sure you understand by now.
Been fighting this condition for 53 years, guess I've learned a few things myself.