Hi Gareth/Alan,
Yes the steps above are how its done. I would add that I have noticed that certain hardware can be different so its a good quick and easy test for anyone new to do to optimize for themselves. I personally do get benefit from more that 3 reactors but it is diminishing returns. The main reason I run more is just because I run each on a different symbol. Its good to have an understanding of all this so the user knows how best to optimize depedning on what they are doing.
For example if you were just developing strategies for 1-3 pairs then it would be pointless to try to run more reactors (and in some cases would be slower as it is on one of my computers).