I had pretty decent success running C5s with 5 RR domis. I used a click bar which had buttons for broadcasting armor and controlling all clients but the one being primaried. That, combined with watch list set up in cap chain order and broadcast window allowed me to run sites in about 10 minutes. However, the domis are just too slow and get ganked too easily. This setup worked wonders in our old C2-HS/C4 hole but not so well in our C5-C5 hole.

I'm currently training my fleet up for 3 gecko ishtars and 2 basilisks for a similar system. I'll be running 1 ishtar and 4 myrmidons with corp logi support until then.

Word from the wise, don't multibox domis in C5s. They work well but they WILL get ganked. PVE RR domis are super easy but the second one of them gets jammed or neuted out your whole fleet goes down.