I'd gate-raid Melvu, Burnquce, and Dismirhas, since that should mostly push the Northern exo-waves through Zortus. Also gate-raid everything in the South west of Yimik (and possibly even two or three hops further than that), since that will encourage exo-waves to only take the Northern route into your space. Then turn Zortus into a fortress world. Assuming, anyways, that the only things you have which are exo-wave targets are your homeworld and your Spire city on Chani.
If you have to, abandon everything except Chani and Ribark, and split your defenses between those two worlds until the first city and its Spire fleet complete, then work on reclaiming the worlds you lost.
Exo-waves in my experience take the shortest route from their spawn location to their target location, though they don't necessarily spawn as close to the target as possible.
I would also consider allowing Ednow and Aidunbark to remain lost, if they fall. Clearing and rebuilding lost worlds can cost resources you can't afford while you are building a city. Alternatively, take Tiopo and Aurin, since that reduces the number of border worlds by 1 and gives you a larger energy buffer, and you'll be taking Tiopo eventually anyways if you're going to put a city in Suokiler.
Speaking of Spire Cities, it looks like you're planning to put cities in Dismirhas and Roadcave, assuming that P5 continues to indicate city sites. These worlds are mutually exclusive, and also have so many connections that I'd be wary of putting cities down in them even if I had a massive Spire fleet. I'd suggest moving the planned Dismirhas city into Ednow, and the planned Roadcave city into either Mikbanguh or Yimik, because increasing AIP by ~100 just to expand a city is a little much, even late in a Fallen Spire game.