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However there are many replies that have given you the answers to your thoughts.
Receiving merits doesn't work with the lengths of your posting patterns, you can receive more than 1 merits from a good post that doesn't have much lengths ie just one line or two as long as what you are saying has meaning and impact to the Bitcoin space/community. Sometimes, if you have tried writing with this pattern and it's not given you merits the way you want just change it to a better way, you will get merits.
In simple terms, merit is given to quality posts - but the quality of a post is very subjective. You will get merit not because you post long or short - but the quality of the post is what determines the most.
My advice is not make post for merit - but regular natural posting is more likely to bring you merit. Also don't create topics to fish for merit - also don't mention merit source to make your post aware, that's a bad attempt in my opinion.