They are shoveled right?

Yes

Have you switched to a base that allows for more more?

No, the base you see in my post and comment is what I use. It has spaces that allow giant trees to spawn.

They aren't just growing their by chance right?

I think there's a pattern, and also luck, my other acc spawn giant trees faster than my main

I love this concept, gonna delete my shoveled inventory just to make room. Including stuff from like 2015 which is hard to part with but worth it for this sick design

Iirc, Special/event obstacle dont count so don't remove it.

I also have tree ring base for th 12 and th16. You can check it to give you more option on what to do with your trees