I've done a lot of research on breeding but have no physical experience yet. But if you're askin for advice this is what I gather:
You may not produce a desirable strain with that many crosses, because you aren't identifying and stabilizing genetics that you want to keep. For example, you might pop 10 BlueBerry seeds, but they will all grow differently (most likely, some may be similar)... Some may even show very undesirable traits (the runts, for example). That is the main issue I see.
To truley breed you need to plant and grow a lot of one strain from seed, determine which traits you want to keep (eg. Vigorous Growth, Bushy Growth, Good Colors, Resilience, etc.), and then breed the plants with the desirable traits together... Maybe the fastest growing plant and the plant with the best structure for example.
After that, breeders like to "back-breed" to stabilize the genetics you were trying to get by making that cross in the first place. A well stabilized strain is back-breed about 2 times.
Then you have a stabilized strain, that you could potentially cross again, or continue breeding for the most desirable and stable genetics. There are endless posibilities.
Hope that helps, and I don't want to dissuade you, as some of these steps don't have to be taken.. They are just recommended