I have a question directed towards fellow Skarner players...(please answer)

So, since the season began, I've been taking: AS Reds Armor Yellows Flat CDR Blues 1 Flat CDR Quint 2 AS Quints

This has allowed me to make full use of Skarner's synergy with CDR as well as Attack Speed, however I feel that the change to Trinity Force has removed the need for CDR in the runes. There are two builds I take with him, Trinity Force/Tank and Iceborn/Cleaver. They offer the most participation in terms of peel and damage, and both hit the cap fairly easily. On the other hand, having 10% early can be beneficial, so maybe they're still good? I want to hear your thoughts!