Ask reference to be more critical?

Hi redfield, thanks for your question! As someone who has been on the admissions side for 15 yrs, I may be able to provide some insight here. Yes- in general it is not that helpful to have all perfects for ratings but at the same time, I'd rather see all perfects than a really low rating on something. I think offering some ranking within the rankings is a good idea but truly better high than low. The comments carry more weight than the rankings generally so I would focus more on making sure your recommender can provide specific examples of your contributions rather than worrying too much about the rankings part.
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Hi this might be an odd question but my volunteer work supervisor agreed to write my recommendation letters but by his tone and off-hand remarks it seems as if he is planning on just essentially saying 10/10 across the board or wherever applicable.

So I'm wondering if I need to ask him to be less charitable? For example if a school sees a recommendation letter with the stories and all that but maybe 5 or so ranking questions (1 to 5, 1 being bad 5 being best possible) and all of them are a 5 does it maybe reduce the value the school places on the letter versus if there are some blemishes?

Basically does a perfect/10 out of 10 across the board recommendation letter lose credibility and is actually worth a bit less than say a near perfect rating?