How to properly manage CDR
So a couple of my rune/mastery set ups give me 5% CDR to start the match (mostly when I'm supporting), which I compliment with CDR boots to hit 20% and follow up with one or two support items to cap out at 40%. My question is, at that point should I sell the boots so I can buy more support items for my team (because most of the support items give more CDR which at that point would be wasted) or is it better to simply build other items at that point (like
on ap supports or
on tanks)?