What if the ID/OD don't match perfectly? Is that asking for problems?
It might provoke the same problems as with any other material was underwicked if the rope is to small compared to the ID of the coil. If the rope is to much larger than the ID of the coil you simply will never get it in there as in my experience Ekowool won't compress much (if at all).
My favorite uses for it are old V1 STM rba's, Lemo2's and just about anything that has those 1/2 moon notches for juice channels. (I have a few TFV4 RBA's that I use rope with) I just size the rope to fill the juice channel and then size the ID of my coil to match the rope. Easy peasy.
I like taking a few hits every so often (could be 5min or 1/2 hour) so I generally don't over vape my silica wicking.
I've ran everything from %100VG to %33VG/%66H2O with silica rope wick (often times with Ekowool).