I've lived on the north coast of Scotland for over 5 years and estimate I've seen 12-15 displays per

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It's not uncommon the see the Northern Lights in the far north of Scotland but your chances of seeing anything will depend on several factors, not least clear skies which often don't coincide with the auroral alumacraft travel cover events. You'll also need clear unobstructed access to the northern horizon and be in dark skies away from the glow of towns and cities. I've only ever seen it once while in Scotland - impressive though.
I personally wouldn't travel a great distance specifically just to try and see the Northern Lights, but if I did, it would be to the higher latitudes in Iceland or northern Norway/Sweden, two of which you've already tried without success.
I've lived on the north coast of Scotland for over 5 years and estimate I've seen 12-15 displays per year but I actively look for them and will get up in the middle of the night to see what's going on. It's difficult to predict, alumacraft travel cover and actually much fainter than you might imagine as even a small amount of light pollution can make it difficult to see. You're always going to be at the mercy of the weather and if the sun isn't very active then there's little or no chance of a display.
If I was on your quest I'd pick a time from about mid-October onwards when there's plenty of hours of darkness, make sure it coincides with a time when the moon isn't going to be visible as this can ruin a display, and just hope the sun and weather play along.