Don't worry; the koralia will come in handy one day! Another possibility is to put the spraybar on 1 side, just like mine and then a koralia on the other side directing it straight into a bushy plant grouping once you start seeing algae.
Dead spots are mostly created by hardscapes and/or thick planting and plants on the lewd (is this correct english?) side of the hardscape becomes a dead spot as the flow is being diverted around the hardscape or the plantings. Your branches are thin, and so is your planting for the time being, so not much flow diversion. Sounds logical, right?
My angels seem to be doing fine. They stay under the spraybar though so they are not in the full current, but they do swim around.