I am sorry for the late replay, somehow I have missed your post, and it went down the list of the forum.
Well, 600 pips is good result for any strategy according to me.
I would not really suggest you to increase the lots of the remaining EAs because this will frustrate your statistics. You will see much bigger profits and losses in the same time for the strategies.
However, if you want to do that, you better look at the pips and not in the Net profit. This way you will see realistic results of the Trading portfolio Expert Advisors, even you trade the strategies with different lots.
Let me know if you have any questions.