I would be hard pressed to start with that ratio in todays market. If you started with that ratio in 2000 or 2006 I would have quickly run out of cash as the market dropped. With the market wher it is now starting with 60% cash might not be a bad idea or using the unadjusted Vwave/Idiot Wave.
Now if it was 2002 or 2009 that would be another issue.
Hi Clive, thank you for the feedback, your insight is very much appreciated. I will consider modifying the sensitivity analysis to accommodate the 80/20 equity to cash ratio.