Higher octane number (91 premium) only relates the fuels ability to resist detonation. 87 is actually more volatile (easier to ignite). SHOULDN'T be causing a problem but the sea foam might. Your fuel pressure was good at the rail, your plugs have been replaced w/oem, new coils. You're waiting on wires and need an adapter to compression test the cylinders. I think that's where we're at. Only 3 things are needed to create combustion, air fuel and spark. Unless all the injectors are completely clogged and can't flow anything (unlikely but not impossible) you should have fuel, the light goes out when cranking so the pcm is getting an rpm signal and you are getting spark (you've tested that), that leaves air. You really need to get a comp test together. When you do it, crank it until you get about 5 jumps on the needle and stay consistent across all 4 cylinders. If they all read within 20psi of each other you're down to injectors. If not you'll need to do a CLT to figure out where the engine has gone wrong. To bad I'm halfway across the country otherwise I'd try to swing past for an actual look.