I totally agree. I, too, experienced the same thing where it didn't take long at all before I became weary of the abundance of the oversized breasts and penises. And, like you, I generally download and play VN's that feature elements that cater to my personal preferences while also, sometimes, allow myself to venture out of my comfort zone, so to speak. This is why I have been able to enjoy games like Leap Of Faith, DMD (to be fair, this game has Elena who is a petite and small-breasted brunette), and The Author. In fact, The Author is a bit of a big-tits galore, lol.
An interesting thing about story-rich games is that, as the game progresses, you tend to focus more on the story line and plot twists, and less on the sexual contents. At least that's how it is with me, anyway. For this reason, I can find even big-breasted characters attractive at times as well. Holly from Leap Of Faith, for example, has fairly large breasts, probably a bigger side of the C cup or in the D cup range. But she's actually the one I find most attractive from that game. Speaking of story-driven, I appreciate Avalon because it features the character Leah, whose breasts are supposed to be "larger than average", and yet they still look proportional while indeed being large enough.
One very important thing for me is that I have to be able to connect with the female characters at least on some level in order to find them attractive. Without this, and a decent story line, I wouldn't be able to enjoy a VN even if it had the kind of body types and features that fit my preferences.