I believe that I've slightly beat the market by using buy-and-hold value investing approaches, but what you're talking about isn't anything I'd recognize as value investing, maybe its some sort of contrarian technical trading.
Be that as it may, I think using 10% of your funds to try something else, isn't bad, but on average, it probably won't work, so.
Make sure you only use 10% of what you put it, not 10% of your current value, consider the following.
Get $1000, put $100 in experiments, $900 in index. One year later let's say the experiments grow 1%, and your index 10%, so.
Experiments $101, $990 index, total 1091. At this point, you really shouldn't say, oh, my experiments are less than 10%, I should push another $8 from the index to the experiments. If you do this, on average, you will be shifting money from whatever the best approach to the worst one, and that WILL have a very strong effect on your returns.
Its also a mindset, its easy for people, if their experiments go badly, say they fall by 50%, to take some of the money from the index to 'make up' for that fall, and then think all is fine.
Another point of keeping a fixed ratio, is that in the future, 2, 3 or 4 years out. You can look at your two approaches, if your experiment has grown by 100%, and your index by 50%, you could shift some more money to your experiment, but if its the opposite, you should bite the bullet, and reduce your experiment.