<<How well would have someone done if they would have shorted when it went to .9 and went long at 1.2?>>
On the surface, it doesn't sound like a half-bad strategy. If I had the data readily available I would put together a quick spreadsheet to see how it does. It is possible that someone like Augieboo has the data readily available to work something up quickly.
But I suspect that it would do even better if you split out that strategy to have "Bull" and "Bear" market rules.
For example, during a Bear market, you could set the long trigger at 1.4, go long 50%, then go long another 50% should 1.5 be achieved. Go 100% short under TRIN 1.1 in a Bear market. When TRIN is between 1.1 and 1.4, then use a 50% baseline short position as the prevailing trend is down.
For Bull Markets, do something similar to the above.
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