That is fairly low compression for those cylinders, but 115 and even 90 I dont believe would be low enough to misfire? is the engine missing when you hit the gas? I would start by switching a good coil for a bad coil and seeing if the scan results are the same. (if you have a scan tool) if they are then you can probably rule out a coil. I would also check injector resistance. you can also determine whats causing a misfire by looking at fuel trim but i dont know if you have access to a scanner like that. Honestly, i just dont believe a cylinder with 115 psi would cause a misfire unless its not getting proper spark or fuel.
Hope this helps