Ichigo Marshmallow (苺ましまろ) by Barasui, the most famous of these types of manga, is missing from your lists. If you haven't read that, then you should; it's a classic. 4chan's /loli/ board was built on both this and Card Captor Sakura thanks to Censored_Vagina (I learned how to edit and typeset thanks to C_V's scanlation guide, and his png_crush tool was useful back in the early days to compress png files; funniest thing is that C_V was using Omanga as an example what not to over-level your pages and destroy the dark tones and details, and later I was contacted by Zyph, the head of Omanga, cause he liked one of my projects).
That said, with my personal bias, these are the titles I found to be the most interesting.
1) Milk Closet by Tomizawa Hitoshi
It's been 20 years and this manga still haunts my memories with the scene where humans are being turned into noodles (and alien creatures singing about it). If there's a manga that highlights the difference between Lolicon Manga from Moe Manga, it's stuff like this.
2) Mahoujin Guruguru by Etou Hiroyuki
A 1990s Dragon Quest-style RPG parody serialised in one of Enix's magazines, it also had its own video game, which was good, and two anime adaptations. The newer anime seems to really pander to its new target demographic, or rather to all the grown-up children who read the original manga, played the video game, and watched the original anime that turned them into severe Lolicon...
Kinda missed the days when OP and ED had songs like this. I generally cannot tolerate the songs for most newer anime...
3) Ichinensei ni Nacchatara by Ooi Masakazu
A slice-of-life serial serialised in Mangatime. I spent a good portion of my life scanlating it, and it was well-received on 4chan with French Anon creating memes for it. As a warning, the first volume was done by Masakazu solo, but after that volume, he gained assistants which acted as a springboard to the manga's quality to be on par with top of the line seinen serials.
Rin, and her goddamn beret, is ultra cute.
4) Neko Mokoro (ねこもころ) by Yoshimiru
A beautifully-illustrated girl-meets-girl story. The flagship title for Yahoo's Comic Flex, one of the first serious attempts at online, digital manga you could read on your computer browser for free. Yoshimiru is a veteran who has done the art and designs for several old video games and anime from the 1980s to 1990s, and the designs of his characters and backgrounds is the quintessence of applied force. The world-building for Neko Mokoro is phenomenal and if there's a work that deserves to be turned into a high-budget animated film, it's this story. Yoshimiru is still posting on Twitter, and I recall him playing with the idea of revisiting this world he created back in 2014. Unfortunately, Neko Mokoro has not been translated into English, but it's a Shounen Manga with furigana, so even if your language skills are weak and you need a dictionary, it's well worth the effort; the art alone perfectly emotes the story. Though reading through it again makes me feel it would still be a monstrous task to properly translate it into English (too much text over art and tiny word balloons).
Lera (right) is my favourite character out of all the manga I ever read. Mokoro hates being alone, whereas Lera is the complete opposite in where she likes being alone.