Sorry to hear that man. At least you figured out a way to make the black plate look cool
I think I have a similar typing technique to you, because I also rarely bottom out on even very light switches. And you already know that I found it fatiguing switching to 45g Topre. Although I wouldn't call it painful, I can see how it could get there if I typed a lot in one day.
The harshness probably isn't coming from how hard the landing is, since landing on Topre rubber + spring is kinda like landing on o-rings already. Plus the handle bar tape experiment made it even softer without any result. I think it comes from how fast your fingers move downward and how abruptly they stop. Because it's so much lighter after the bump, the force required to get over the bump (although pretty light and smooth) still sends you racing to the bottom after you get over the peak.
I'm just hypothesizing all this, but if this really is the reason why your fingers are hurting, then there probably isn't really a way to make 45g domes less painful. You could maybe look into getting a 30g Realforce. At least for me, it's the most comfortable typing experience for my style since it's smooth throught the entire curve and doesn't require bottoming out. Going back to 30g after of a long day of 45g is like going to a spa...haha