For instance does a higher overall number mean the person is more or less likely to be pollinated? It appears that the individual numbers being higher increases the odds of pollination, but the overall score being lower increases the odds of pollination.
In all cases higher score means higher chance of pollination.
If a sims' overall number is at or below 50, is that person considered a redneck (assuming I'm using the default settings)?
The other way around: If a person is considered a redneck, the redneck score (50 by default) will be applied. Only rednecks get that specific score. After that there's no special treatment for rednecks.
Job Score (JS) - based on level of job
Level and income, the latter probably being inaccurate for the new career types. Plus, there's a little malus for part-timers.
Financial Score (FiS) - based on total value for household, including house, lot, stuff and cash on hand
divided by the number of sims belonging to the household.
Family Score (FaS) - based on single/married, number of kids already have
Plus mali/boni if the sim or her partner are polyamorous, live in the same household, are overstuffed, have a free crib.
ReS - I have no clue what this is. Is this the raw Redneck score?
That is the Relationship Score. Kinda sneaked in unannounced with either the update for the Ambitions patch or the bugfix. It's a measurement for the age and trait compability of the couple in question.
Age Score/Compressed Age Score (AS) - first number gets higher as you age, the second one is bell-curve-ish
Age score is already bell-curve-ish and with the default age shifting it's a pretty good approximation of the RL distribution of the age at which women give birth (in the so-called First World nations). Since this score is actually multiplied with the sum of the other scores and not just added, there's the possibility to lessen it's influence with compression. That simply means all age scores will be shifted in direction of the middle, i.e. 500.
Wish Score (WS) - higher if family oriented or showing want to have babies
There's no wish to have babies, not for inactive sims. It's entirely trait-based with a whole lot of randomness for insane sims. Wish score alone is actually pretty crude, but I think together with the other scores it gives a pretty good assumption of the overall situation of a sim and the likelihood of him/her developing the wish to breed.
Risk Score (RiS) - higher if flirty, hopeless romantic, great kisser, party animal
Basically yes, as it is also entirely trait-based. The only trait taken into account of the ones you stated is flirty (and unflirty). The others are more like indicators for the question whether or not the sim is likely to omit contraceptions or fuck up at using it. Like genius, absent-minded, dumb (if AM is present), daredevil, loser, lucky/unlucky and a few more.