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Have you checked out the recommendations section on the site for the manga you've read and enjoyed? Although there aren't as many manga recs listed here, more are being added all the time. (Note that you can also add YOUR recommendations as well to help the site and to help your fellow members here!)
Also, if there is an anime associated with the manga, you could check out the recommendations for the anime (especially if there are not many manga recs) and see what other titles may be similar. Just keep in mind that sometimes an anime may differ significantly from the manga, and so the recommendations from the related anime may not be quite so accurate.
I checked out the recommendations for Mamotte manga, the first one on your list, and the site recommends reading UltraManiac! Since you have not listed that one as one you have read already, perhaps that would be a good starting point?