Well, I will eat crow here and just call this a big crap shoot.
There are point holders in the high number range that COULD cause a jump in points needed. I have tended to look at the numbers for each hunt code to get an idea of what point holders applied for it last year, and if I care enough, look at prior years to see if there is a somewhat linear climb.
With the below screen shots, I see that there are at least 1,886 NR folks who had 17 points last year and gained a point. This does not include people who applied for other hunt codes unsuccessfully last year with 17+ points and now have 18+. With those numbers, it is possible that the hunt code below COULD go to 29 points just if the top four people who applied for a 1st choice preference point applied for it. That could be said for any hunt code.
After looking at the way the preference point holders are distributed, it might be more likely that needed points jump the most in the lower point units.