Most of these are rom-coms that have to do with school life, but I'm sure if you liked the series you listed, you'd enjoy these just as much! There are a lot of others but I honestly think these are the ones that are most worth watching out of the bunch.
Boku wa Tomodachi ga Sukunai - Also deals with Childhood friends. Wasn't a big fan of art at first but I started to like it. The character interactions are hilarious as you see the main characters constantly giving each other funny remarks.
Chuunibyou demo Koi ga Shitai - There's no competition from the MC, but it's still a fun rom-com to watch. First few episodes are laugh out loud funny, and last few are pretty emotional.
Full Metal Panic? Fumoffu - This is the second season of the series, but you don't really need the to watch the first season to understand the second. The second season mostly revolves around the slice of life themes of the series about their school life and is a very fun watch.
Gekkan Shoujo Nozaki-Kun - If you like the slice of life aspect of Nisekoi, this is an adorable and funny one to watch. The main character has adorable reactions towards her crush, and despite me sounding a little corny here, there are moments in where you can feel how she feels in the series.
Girls Bravo! - Harem city.
High School DxD - Don't be put off by first impressions or what people say, if you don't mind ecchi in anime, this series is honestly not that bad. It's a very fun watch while having tons of action to add on.
Ore no Imouto ga Konnani Kawaii Wake ga Nai - A controversial series, and you'll find out why as you watch. There are some noteworthy things this anime does uniquely, so it's definitely worth the watch.
Rokujouma no Shinryakusha!? - This anime is severely underrated in my opinion, as it is a very fun series to watch. It does a harem right, and without overdoing things, it provides a unique sense of rivalry between the characters and their interactions with the MC are always fun.
Sakurasou no Pet na Kanojo - You'd love this anime for the same reason you'd love Toradora, as the moments between the characters can get really dramatic. The characters are enjoyable too and it's probably the type of rom-com you're looking for too.
Yahari Ore no Seishun Love Comedy wa Machigatteiru - With one of the most highly anticipated second seasons coming, this one takes a more 'negative' approach to the rom-com genre. After being introduced the main characters, you can definitely see what I'm talking about.