Measuring Vackar Oscillator Output Amplitude and High Frequency Effects
This is not intended to answer all your questions, rather give more insight.

This MSc Thesis may help see how the non-linear approach used by  Clarke &amp; Hess  works for different RF oscillator designs.

Oscillator Phase Noise Reduction
Using Nonlinear Design Techniques
by
David S. M. Steinbach 2001

Taking the Fourier transform of a
pulse or series of pulses in the time domain yields a number of frequency components.  

This harmonic trade-off is an important
consideration in reducing noise content by using shorter pulses.

Examples are given for CB CE and CC configurations of oscillators.

Accurate models are needed for simulation and calculations get messy.


Good reference on Oscillator Phase Noise
    http://rfic.eecs.berkeley.edu/~niknejad/ee242/pdf/eecs242_lect22_phasenoise.pdf