First thing to do is to use the current symbol and current timeframe in all options so your ea will work in all timeframes for all pairs and it will be easier to test. MT4 does no backtest expert advisors that are multitimeframe so if you put the time frame 15 in the TA icons, you should backtest it for the 15 min option. The other options (1m,1h,etc) won't be reliable.
Please post your custom indicator for us to understand the ea.
Many posts in this forum talk about stochastic. I did a quick search for stochastic and got this:
viewtopic.php?f=6&t=134&p=526&hilit=stochastic#p526To define crossovers you can read this
viewtopic.php?f=2&t=131&p=523&hilit=crossovers#p523 - or you can use the latest beta - the new next trade management feature for v3.15 makes thing easier
Finally, you may want to take a look at the oversold examples here
http://www.molanis.com/products/molanis ... rs-for-mt4 - The logic is the same