Please don't increase merit per post according to their same quality.
It is not fair for people years ago have to struggle to rank up and nowadays simply posting some merit-fishing initiatives and receive a lot of merit. I don't call them as shit posters, their post quality is good enough but let's keep their rank-up as natural as it should be. Don't distort your rules of meriting only because you feel you must keep your source-merit bag as emptiest as possible.
Personally, I have never followed this tactic, giving away most often the minimum amount of merit per post (probably for this reason I have always ranked 2-3 among the most generous sources of merit

) I always tried to increase not the number of merit per post, but the number of posts that can be rated by merit, so my average number of rated posts often exceeded 700-800 posts. I have always made it a priority to reach as many good posts as I can find on the forum, but that was taking a huge amount of time.