Hacking votes has long been a problem on HN. It's well known that if you can collude to get enough votes in the first 10 minutes or so of your post, you can make the front page and continue to get votes based on interest. Without a hack, it's likely your post will barely get seen by anyone to even get voted on.
It'd be eye-opening to see the breakdown of traffic to the front page vs. the newest page vs. the more pages.
It seems like if you want your post to be seen, and actually voted on, you have little choice but to try and game the system. Maybe this is what YC wants.
Why not consider making the front page a little bigger to reflect the increase in submissions over the past several years? 33%? 50%? 100%? There are many other ways to relieve the pressure to game, but this one is a relatively small change.
There's an alternative. Posting good content. Sure, good content doesn't guarantee upvotes and collusion does. But colluding doesn't provide the feedback that teaches a person how to distinguish good content from mediocre, or good submission timing from poor submission timing.
That's assuming of course that someone thinks those things matter. I am not sure that they really do, except in so far as they matter more than karma points - particularly those gleaned from submitting other people's work rather than writing one's own comments.
I'll admit I'm probably out of touch, since my mental model doesn't really include the elements that fret over submissions making the front page. That's probably because I focus on writing, which is less about luck and more about skill.
It's not that I think the mechanics of HN are perfect: It's that I think HN is not broken.