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I'm kind of getting pulled in to something here...
The last time I had to deal with high RPM ghosts was on a 3.3 dodge caravan of all things. What eventually fixed the issue was replacing all 3 crank sensor wires between it and the PCM. Ended up overlaying wires from the PCM to the crank sensor to fix the issue. Man that van was a dump, we told the owner to consider retiring it like 5 years ago but it's still going! It's a mess holding together with tape and steel wire but it's still going!
I guess if I had to take a stab at this issue... First step is Mode $06, see what's really misfiring before a code sets. then move the coil (thought I read it's a new OE coild) and plug to different cylinder then drive the car to try and see if RPM/Load can be dissociated while recreating the issue, probably while having a scope on the crank signal looking for glitches...
It's also productive to keep fueling in mind. in many diagnostic charts from toyota, they have you going in bidirectional control to subtract/add fuel to the engine to induce the offending cylinder into revealing itself. Like if you go +/- any given % and cylinder 1 starts missing, your issue may not be spark related.
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