TDD is total daily dose by the way (long acting and quick acting when looing at a normal day) so if I had 4 QA in the morning 4 with lunch and 4 with tea then 10 long acting at night my total daily dose would be 22 .
So if I had keytones of 1.5 I would have 2 to 3 QA units every 2 hours if I had keytones over 3.0 I would have 4 QA units every 2 hours. This would stop when glucose leves and keytones drop again.
As I said before though best bet is to contact you diabetes team and get them to talk you through it.