As long as you are only going to trade one EA then the 3 lots for a 100K account is the recommended lot size as it limits your risk to 1%. If you are only going to trade one EA on a 200K account then the recommended lot size is 6 lots as this limits the risk to 1%. However, if you are going to trade more than on EA in the same account then you need to divide the 3 lots or the 6 lots between all the EA’s you plan to trade. This way if they all hit the SL then the account will only lose 1%. The idea is to limit the risk to the account to 1% and not each EA. While limiting the account to a risk of 1% you can always limit the account risk to a lower amount.