When using the phrase "most all," it is important to note that it may be redundant. This is because "most" and "all" are similar in meaning, so using both can be unnecessary. If you want to convey that something applies to nearly all, you might consider using synonyms like "almost all," "nearly all," "practically all," or "virtually all." You could also consider rephrasing the sentence to use a different word entirely, such as "the majority of" or "nearly everyone." By using more precise and concise language, you can make your writing clearer and easier to understand.