Hi Alan,
It would be logical to continue using that EA that you have faith in and had some good success with in demo for two months and it’s good your not going too fast. Might be an idea to test your new plan using demo also though, but scaling up with small money to start is also fine really (as long as can tolerate any drawdowns and losses with real money).
Remember that in using the EA from top 5 course that it was selected for you. Picking 10 from this selection means you are picking yourself so there is a difference.
I’d suggest also trying to pick less correlated EAs to combine also rather than just top 10 profit factor for example