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Calculate SOLT substrate definition using lab-made RF probe

Question asked by rfprobe on Oct 29, 2013
I need help to calibrate a 10G lab-made RF probe on a commercial SOLT substrate. 
S21 on a clean PCB  trace has small +/- 1 dB ripple at 4G after SOLT calibration. 
It seems that VNA can't remove the discontinuity on the probe tip. 
The probe tip is not as good as microwave, but with very short ground and signal tips. 
My question is how to get the C0, C1, C2 for open,  L0, L1, L2 for short and delay for load?