Practice Routine: Modified Doubles

Sometimes I want to practice both doubles and sixties but have a hard time deciding best how to alternate among them. Or at least I used to have some trouble with this. These days I am almost always throwing the Flight School 'Accuracy" routine but when I want a break from that I throw a modified doubles practice that incorporates both sixties as well as the doubles. Here's how it works:

First dart of every round is aimed at the triple 20. If it hits then you stay on the same target regardless of the result of the second dart and try for a 120+ score. If the first dart misses, however, you abandon the sixties and the remaining two darts are aimed at the
doubles as if it were regular doubles practice. So you do the doubles in the standard zeeple order: 16, 8, 4, 2, 1, 20, 10... So let's say we just started the practice and the first dart missed the sixty. The second dart goes for the double 16. If it hits then great, you move onto double 8. If that second dart is a miss though you either go for the double 8 (if you missed inside or missed into the double 8 leaving 16), or you stay on the double 16 (if you miss anywhere else). Once a round is over though all that carries into the next round is where you left off with the doubles. So let's say that the second dart misses inside the double 16, the third dart then misses outside the double 8. The first dart of the next round again misses the sixty. What about the second dart? Do you go for the double 8 because you had 16 remaining last time, or the double 16 because you have not hit it yet? The correct answer is the double 16. It doesn't matter what remained last time.

So that is my modified doubles routine. I have been sticking with the Flight School routines mostly though.