no your fine. There is a lot of evidence to suggest you "SHOULD" pitch correctly. However when I first started brewing I was always under-pitching...and my higher OG beers always attenuated fine. 1080 with a scottish ale year is a tad bit high but I'm positive your beer will atteuate out fine. I've made way heavier beers and only threw in a single vial of california ale and it had no problem going from 1090 to 1020, but it took 3 days to start fermenting. so theres a trade off.
I always thought this site was newb friendly and it is, but sometimes theres too much information and to much "hardcore" brewing information here, and then people get harsh with the new kids when they do something sub optimal.
I still underpitch quite often. I don't have a schedule that allows me to make a starter 3 days before because I never know when I'm getting called in.
So me? I overpitch onto yeast cakes every week, and I underpitch new beers after its time to get rid of the yeast cake by only pitching one vial.
So I do everything "Sub-optimal" but guess what.
My beer comes out great...so its better to RAHAHB then get to caught up in some of the more detailed specifics posted here. Strive to improve but do realize your beer is going to be just fine.