Thanks for recommending
The New Mrs Harris. I just read the first 8 of 29 chapters and I am really enjoying the story so far.
I'm also very interested in reading stories where a woman experiences the burden of large breasts. I'm not sure why, but I just really like the idea of a story that focuses on a petite or fit woman having to experience and endure big boob problems due to a magic spell, curse, potion, reality change, etc.
For example, I would love to read a story about a female athlete being suddenly saddled with large natural breasts on her fit petite body. It could be a lot fun to read how her large breasts now overshadow her athletic performances, much to her frustration. Her soft, heavy breasts weighing her down, affecting her performance in embarrassing ways. Desperately trying to be taken seriously as they bounce, jiggle, and sway with every step, pivot, and movement in an outfit that now fits her bust in annoying ways. Using her impressive athletic abilities to initially overcome the odds "stacked" against her, only to have pivotal moments undermined by her big natural boobs.
Another one that I would like to read is a petite female nerd who finally gets her wish to attract the man of her dreams using a powerful magic spell, but the trade off appears to be that in order to attract a man like him, she needs to have large natural breasts. And while it's initially a dream come true for her to have a tall, handsome athlete start to become genuinely interested in a relationship with her, it comes at the cost of being saddled with massive mammaries on her petite frame, and being annoyed by all of the big boob problems you listed.
I usually picture someone with Tessa Fowler's body type for stories like these.