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I would say it's time to try again once your current generation's quality has plateaued, which it sounds like it has. I have culled my projects twice and started again. I'm about to scrap half my 3rd gen here soon. I just get too attached to the flashy ones and feel like maybe if I hang onto them, they'll come in handy one day. I know I'm just stalling my progress though. It gets frustrating for sure.

Hmm, that AI thing might be worth a shot. I will try it before engaging in a mass neuter event:). And @DarkFrost, that is a really good point. For the one line, comparison testing with a colt from this year suggests my ‘best’ 2G studs weren’t as good as I’d thought.

Some years, the roll of the dice just isn't your friend and every mare will produce on the worst half of her range.

I recommend taking one colt that you've comparison tested extensively, make it a filly and then comparison test against all the mares of that generation. That will give you a good idea of where any inequalities lie.

I'm stalled out at the 10th generation on my HJ2 barn. But with a bit of experimenting I have found that one 1% boost makes them superior to their parent, so that tells me I'm not TOO far off base. In lower generations it can take 3-5 boosts to bump them up high enough to be superior.

Copying this from @SandyCreekAcres response to my "Rank" question :
Generally speaking, the higher the Herd Helper's rank, the rarer its combination of color and pattern or breeding ability percentage (that is: Exceptional Producers will have a breeding ability somewhere between 101% and 104%, variable PT scores and may be consistent or inconsistent. Exceptionally Perfect will have PT of 10.4, breeding ability of 104%, and 100% consistency). Perfect Foundation have 100% breeding ability (top of C/Yellow), 100% showing ability (PT 9.9), and are 100% consistent.

@ConfluenceStable I totally feel where you're coming from. I started my first year of college as a pre-nursing major, then got a few weeks into Intro college algebra and Anatomy and remembered how much I hate math and science; I noped right on out of those classes and change my major ASAP. Now I'm about to get my BSW and am over the moon that Stats is the last math class I'll have to take for my entire academic career, including my masters, and it only took my 4 attempts to pass the class.

I'd love to read about the experinent... but definitely not the one who should be doing it. LOL

@Kintara if you'd want to share the logic behind how you worked it out I'd be happy to re-do as an experiment :D

What I have so far (at 2G) is 10.5PT A-papered stud, testing superior to both my 10.7PT A-papered stud and my 10.9 PT A-papered stud, one stud was out of ExPer and the other a 1% boosted ExPro. I also have a Blue-papered mare with a 9.9 PT.

PT isn't linked to breeding ability - although that would make it easier to weed out low scoring foals.

@Ammit is it public knowledge the % range of an AGA comparison test? :) I'm aware it's smaller than the range between papers, but not by what margin.

And now thanks to @Johara I've got a new culling method. My pixel ponies are shaking in their horseshoes. >:)

Great conversation though! I've got nothing beneficial to add, my lines have been halted at 5th generation for a while. But I've also not been dedicating as much time to them as I could.