There is a section in my book dedicated to starting oscillators:
The Designer's Guide to SPICE and Spectre (see page 209). You would benefit by reading it. In a few words, my advice boils down to this: If your oscillator does not start:
1. choose a different way of exciting the oscillator that better couples into the mode of oscillation
2. force a small time step (say 10-20 points per cycle) using maxstep
3. switch the integration method to trapezoidal
Of course, I encourage you to read the book. There is a lot more information there.
-Ken