When we use most before articles (a/an, the), demonstratives (this, that), possessives (my, your) or pronouns (him, them), we need of
More Or Most. Most tap water is drinkable. But i may be mistaken.
English worksheets: Adjectives: -est, More/Most, Worse/Worst from www.eslprintables.com.es
For example, he made several more successful efforts is ambiguous. Like comparative degree of neat should be neater or more neat. It indicates a greater amount or number than that is indicated by much or many.
It might also be that it is a thing of regional or individual preferences.
I think the more common form is 'the most', and i think 'most' is only a matter of shortening the adverbial. You should sleep more than you do at the moment. For example, he made several more successful efforts is ambiguous. But i may be mistaken.
