This post is coming from someone who is relatively new to imageboards (as well as this site), so feel free to take this post with a grain of salt.
BUT with that being said, I still think my two cents are significant, since they come from a relatively neutral perspective, as well as a person who is interested in imageboards.

I absolutely fucking despise wojaks and I love loli. While I like Heyuri for these reasons, I can see why some might get sick of loli posting when (like OP has mentioned) most of the threads on /b/ are just loli dumps and when most of the OC lately is just "LAWL WHACKY LITTLE GIRLS".
Don't get me wrong, I really do like Heyuri, but I'm not going to blindly worship every facet of it. Like the administration.
I'm sick of people bitching about janitors (especially when those doing so basically deserve to be banned), but hailing the administrators/managers/mods/whatever as gods is nearly just as bad. Granted, I'm new, and this might just be a thing in the flashes I've seen, but it still irks me. NOW BEFORE YOU ALL GET YOUR PANTIES IN A TWIST, I'll have you know that I fully agree with the policies of Rule 8, and I'm not just saying this since I have a hateboner for all moderators.

However, these are all just my opinions, and may not reflect reality. And fixing these problems is really easy anyway:

1. Encourage OC creation
I don't mean the basic saying of "just make moar oc lol" that I've seen, but actually encourage OC creation. Make an exploitable and put in in a thread to see what people come up with. Share tips and resources for learning how to use Photoshop/GIMP, etc. (although I sincerely hope that the average Heyurian has at least the most basic knowledge of image editing) Find something that's funny or worth making fun of that people can do stuff with. This may be asking too much, but I really think it's the way to get OC pumping.
2. Provide/Receive constructive criticism
This may not be too big of a deal, since /q/ seems to be doing a pretty good job of this, but I think it's still worth keeping in mind.

Overall, while Heyuri does have its flaws, it is still by far one of the best imageboards I've been on, and that is why I want it to grow and get better.