@Bigboolean
Adding my recommendations;
Ratman,
Love Fighter Shuravan, and
1000 Yen Hero are nice straightforward shounen hero mangas, can't really say that they are pure Tokusatsu because they're closer to Western Superhero genre especially because they have an abundance of heroes in their world.
Koutetsu Kishi Chevalion tells a nice after story for a Sentai team that has defeated their villain group, sadly it hasn't been scanlated in a long while. And
Baito-saki wa "Aku no Soshiki"!? doesn't really deal with toku heroes per se, but it's a nice refresher to actually see how an (idiotic) evil organization operates.
And my personal favorite is
Tokusatsu Gagaga which is not really about Tokusatsu, but more so about the Tokusatsu Otaku culture. Highly recommend this. It also has a live action version too.
Hope some of these catch your interest.