I use somewhat similar methods, but the fact that you claim to be using a 10wk/40wk EMA says to me that have not been doing this with real money. It is actually barely better than flipping a coin, and if you had used this method last summer without any hysteresis, you also would have had a sell signal and you would have gotten whipsawed.
I am longer term oriented and use 19wk/39wk EMA to be confirmed by the weekly MACD. This system has made 4 whole trades since the start of 1995. Note that I go long and short.
My system is not in sell mode now, and I am looking to buy into a correction until the situation changes. Trend following indicators look bad right now, but you do NOT know that the situation is different from last summer, when one of my two indicators went to the short side but the other did not. I can (and have) make the case with Elliott Wave that this is just a large wave 4 triangle that will be resolved to the UPSIDE ultimately.
Also, in the 2 major tops in the last decade, when my indicators gave sell signals, you could wait about 5 months the first time and 2 months the second time to get out at even or higher prices from when the signal occurred. So there is no reason to rush to the exits.
I am sitting on 2 SP500 (full) futures contracts and 3 Comex gold contracts and am looking to buy at fire sale prices until the long term trend following indicators suggest otherwise.
If we do not get a major rally soon like we got last summer, the top will be in.