I'm kinda ok with basic "The more..., the less..." type of sentences, like
The more you think about it, the less likely you are to take action,
but what if I want to say next:
The more repetitive this action becomes, the less sincere it... er... becomes?
Something is wrong here. Replacing "becomes" with "is" in any or both parts doesn't make it better I think. Or should I give up on this and paraphrase it as "Repetitiveness of this action makes it less sincere"?
This particular sentence is not very important but I would come up to this question anyway sooner or later because I often say things in that way in my native language.