Yes, my findings surprised me. They showed that gold has been the metal to buy & hold most of the time, and that a mixed gold/silver strategy did not outperform a gold-only portfolio, even if you did some swapping along the way based off a fixed GSR price. This is because gold has outperformed silver long term by 3%pa, so even if silver was a better short term buy, over the long term gold reasserts itself.
However when I threw out the fixed buy/swap price levels and replaced them based off moving averages silver I managed to get a significant bump in return by swapping gold|silver at very extreme price levels. You don't want to be doing this too often just because transaction costs will be significant, and actually the model showed me that once every few years was the best performing strategy anyway.
I am not suggesting that gold will continue to outperform silver by 3%pa over the next 48 years as it has in the last 48, but there is nothing to suggest that it the trend will reverse. Gold is money and the ultimate store of wealth, while silver is, at least for now, primarily an industrial commodity with some monetary qualities. That's why I believe that unless silver is remonetized, we will eventually see GSR at 100+ and trending higher in the future (even if we revisit 40-50 area first). I don't ever envisage the GSR returning to 15:1 the way the metals are being used at the moment.