That's interesting. I've read that it is recommended that all the plants should be of the same strain. In fact, I ran across an interesting article in Science Daily where researchers found that plants can recognize their "siblings" and are more likely to share root space with them than with unrelated plants, I kid you not:the last thing you really want to grow all the same strain per cycle in that box.
http://www.sciencedaily.com/releases/2009/10/091014144734.htm
I wonder if this holds true for clones. Anyway, I'll have a chance to find out because retirement is just around the corner and I will be able to experiment to my heart's content.
Why don't you like a grow with all the same strain?