What if CDR cap was removed and was multiplicative?
I'm not saying I want this. This is just to bring about discussion.
The 20% items would have to be removed. I would do this by changing all non legendary items to 5% CDR and reduce the 20% items to 15%. For those of you who don't know what multiplicative and additive means when talking percentages:
With additive, you just take the percents and add them like we currently do.
With multiplicative, you first take the inverse of the percent and then multiply them. This gives us what is called diminishing returns. Each instance of CDR gets less and less effective than the previous one. Here are some examples.
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Currently = 1-(1-0.2)^2=36% CDR Changes = 1-(1-0.15)^2 = 28% CDR
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Currently = 1-(1-0.2)(1-0.1) = 28% CDR Changes = 1-(1-0.15)(1-0.1)= 24% CDR
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1-(1-0.1)^6= 47% CDR
Viable max CDR build on a Juggernaut: 
1-((1-0.15)^4)((1-0.1)^2) = 58% CDR
