Really interesting post!
Regarding the non-correlation between the different methodologies: isn’t it the case that the two methods are not even trying to measure different things. There was a bit of talk of this at the Good Done Right conference, where it seemed like the consensus was that e.g. person tradeoffs try to measure something like the wellbeing associated with health-states, while the newer method simply measures a more removed concept of healthiness. These two may come apart especially in cases of really unhealthy states that do not change your wellbeing significantly such as becoming paraplegic.
So am I right to think that the point of the haste consideration is that there is a “return on investment” on doing good? Many good things you do will in turn cause other good things to happen and so good things done further in the past will have had more time to do good through indirect effects. If so, it would seem that it would be really important to think about what good things actually have these indirect effects.