Everybody does it differently. You're going to get as many answers as there are responders to this thread.
When I enlarge I always split grade print. I start with 100 yellow and 0 magenta and expose until the highlights come in. Then I increase contrast on the second exposure until it matches the negative so that I get the overall contrast I want. Along the way I pick up the information I need about dodging and burning that will be required.
Test strips are a waste of time. There is no general 'target contrast grade'. Each negative is different and requires a different level of contrast. The 'target' is what your negative requires.