I agree we need to improve this for Johny (and Uncle Tom). Which are, incidentally, the highest difficulty normal starts.
Most of the other normal starts do not seem to have this problem with Isabella.
Do you like the changes since 2.2.0 outside of the training system?
These factors are different motivators for obedience. This says she is strongly rationally motivated to seek rewards and avoid punishments (awareness is her "it is better/safer to obey" self-talk) and is highly accustomed to following orders (habit is her acceptance of slavery) but does not instinctively feel that the slaver is superior (taming is reflexive obedience, her motivation to obey before thinking about it). Finally, she is motivated to obey because she has begun to adopt a slave morality (judging herself by how well she serves and pleases her owner before attending to her own desires).
The idea that taming can diminish without aura superiority didn't come from nowhere. Quoting the tutorial in 1.7.5:
With the goal of making training more varied, we've increased the extent to which attributes influence outcomes. A slave with S+ nature (willful) is consequently harder to tame. A couple of points difference here or there can have a big impact, as in the scenario you are experiencing. We can make this better without discarding the concept that taming can decline with low aura strength.
Isabella used to be a bit of a "cheat" - or at least we felt so - because of how good her stats were. We wanted to reflect her back-story better. She is desperate to escape from the Slums and she trades conditional obedience ("Just do not go too far; I will not work in fear") for safety. She also was not able to get into the city on her own merits, because of her age and appearance. So we adjusted some of her attributes and traits to better align to that concept. But we took it a bit too far since she is not fulfilling for you her promise ("if you treat me fairly I will do anything you command"). A boost to her obedience is clearly justified.
Johny is a weak child so it's not unreasonable that he has trouble taming a mature, strong-willed adult. Even if Isabella's taming drops to zero, she still is useful as an assistant. I gave several examples earlier of how she
can be tamed even in the current version. We've updated the tutorial to describe additional methods of raising taming.
Let's examine whether Johny can prevent Isabella from losing taming in the current version by boosting his aura strength:
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Johny is labeled "maximum difficulty" and "cannot afford an apartment yet". So it is expected that some time will be spent living in the Slums before acquiring Isabella, during which time Johny's dominance characteristic will develop. If Johny moves into the Serpis apartment, his Personality will rise and stabilize at D-. If he raises his Allure and acquires Noble Regalia, his aura almost matches Isabella's. If Personality rises to C- or strength to B+, no taming loss will occur.
So we could adjust Isabella's attributes here so that she is weaker, but I think a different solution (see end of post) will be better.
C+ food only drains B+ strength by 1 point. Johny has a high libido so he can gain multiple strength points each day either from sex or from physical punishments (if sex is refused). Even if Isabella's taming is zero, one point of fear is enough for her to accept sex currently.
Devotion can increase even with zero taming, which would double her obedience in the current version. For example, raise Johny's allure (spa men's treatment) and Isabella's mood and put a wedding dress on her:
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All feedback is appreciated and will be taken in good faith, especially when it is detailed and constructive as yours has been. Thank you for taking the time to test and share your observations. While we may not (yet) see eye to eye on design, I hope we can continue to look for common ground.
For now, I've updated the dev build to 2.2.6.15 with a backwards-compatible boost for Isabella's obedience and a reduction in the rate of taming fading overnight so if you load your game with the new version she should be at least D+ (limited from C+ by lack of common skills) even with zero taming.
I've also updated her profile so that when she is acquired in a new game she will start with zero taming. After all, she barely knows the slaver when she is first acquired, and she is brave and willful.