Alright, I won't argue with that last point. However, I doubt that it is assumed by those who know this that gravity prevents expansion. However, it is commonly taught, and so must be commonly accepted. It would only be commonly accepted if there was significant evidence for it, in which case it must be true. Since there is evidence that expansion is more significant in lesser gravitational fields, your theory should account for that.

I will admit that I am by no means an expert on this topic, but commonly accepted theory just can't be thrown out on a whim. I hope that you would respect others' theories as much as you would like yours to be respected.