The CSR doesn’t care about KD at all.
Which is good. KD isn’t a great stat.
Your CSR at the end of each game goes up with a win and down with a loss. Maximum 15 points. The bigger the “upset” the bigger the change. But also, very importantly, your CSR is “chasing” your MMR - and it resists moving away from it.
The only metrics for personal performance are kill and death rates (KPM and DPM). These are very different from KD and KDA etc. And they only affect your MMR - which can then affect your CSR in the next few games.
And remember they are only weightings. The important part of ranking up is always beating sides ranked above you and not losing to sides ranked below you.
Microsoft looked at a bunch of metrics for TrueSkill2; K, D, A, KD, K-D, KDA, damage, objective scores, medals, etc.
And the only ones that predicted success at a higher rank were KPM and DPM.
It’s not saying things such as playing the objective aren’t important. They are. If your team doesn’t do them well you don’t win. And winning is how you rank up. So, they pretty much define your rank.
You can read the discussion paper here;
https://www.microsoft.com/en-us/research/publication/trueskilltm-a-bayesian-skill-rating-system/
What they are saying, essentially, is that if you rank someone up purely on their objective score they just start losing and making themselves (and their team mates) miserable.
Then you may be doing it wrong.
Oddball for example. You should never die plenty. You should get kills winning the oddball. And then when the opposition come to win it back you should be dropping it and fighting back.
Something I am not very good at though. 
Similarly with zones or the flag. The meta should be slaying the opponent until you have the numbers and then pushing the objective. Yes, in some games you will die more often doing so, but that’s OK as KPM is weighted higher than DPM. The important bits are that you are still holding your own in 1v1 (the most important skill) and you are killing the same as your team mates and opponents.
If you are the only player on the team dying to do the objective that is bad;
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Good teams share the objective duties. I get that some people find the objective bits fun (I certainly do). But if you are doing all the heavy lifting at the expense of your KPM and DPM you may not be ranking as high as you could.
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You may be hiding behind the “objective” to hide your inability to win a 1v1 in the harder games.