Hi Adam,
why do you want to change the SL and TP manually? There is no sense in this. if you want to use exact SL and TP for your EAs you can set them in the strategy and optimize the other parameters with the Optimizer. But if you have a generated strategy and after that, you change the SL and the TP do you get better results with EA Studio backtest? I doubt it…
I see you are putting some manual trading emotions in your EA Trading. i guess everyone does that at the beginning. If the price reaches towards the TP, you should not hurry to close the trade or to get angry if the price gets the other way. That is exactly what causes manual traders to lose.
Leave the EAs do their work, and just monitor them on Demo and live account. if you see which ones are profitable(as you have some already) you can place them on a live.
Have a nice weekend!