Some of your points are very curious. Biologists did not reject horizontal gene transfer. Or at any rate it has been part of the canon for pretty much the last 60 years which is essentially forever in biology. (The mechanisms for heredity, i.e. DNA were only discovered in the early 1950s). Besides, scientists are always "tweaking" theories as you put it. More precisely, a fruitful and productive scientific program leads to more and more discovers and elaborations that have to be accomodated. Look at the changes in the Standard Model in particle physics. The current controversy is whether and why the Standard Model is no longer being "tweaked". In other words, some physicist wonder whether current research is no longer yielding discoveries that allow advances and hences changes or elaborations to the Standard Model.
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