The GERS figures are produced by Scottish Government statisticians. Why would they massage the out of Scotland's favour?
The UK is not "a few Daily Mail stories" away from burning down Pakistani corner shops, Pakistani immigration having nothing to do with Brexit whatsoever of course. That's the kind of ridiculously over the top drama that lost the referendum, and it boils down to a form of racism itself: a belief that white English people are just horrible and ignorant, in defiance of all the facts (the UK is one of the most racially diverse countries in Europe).
Finally, I don't know what kind of independence campaign you remember, but the SNP I know practically defines itself through racist hatred of the English. Their entire argument for an independent Scotland seems to boil down to "we hate the awful Tory voting English".
This is in direct contradiction of my experience of being English (RP accent and all) at Indyref events and the SNP conference itself. There's maybe one or two fringe old guys who are actually anti-English and everyone else finds it embarrasing and is genuinely friendly.
Everyone does hate the Tories though.
And now it's even more disputable with Brexit: what farm subsidies will Scotland recieve, for example? What's the future cuts scenario for the UK? What happens if the rUK starts mass deportation of EU nationals? Parts of England are a few Daily Mail stories away from burning down Polish or Pakistani corner shops.
The UK had its opportunity to choose inclusivity and openness, and instead England voted for reactionary panic. I think it's hard to underestimate how much work the SNP have done in declaring ethno-nationalism and anti-immigrant sentiment unacceptable, and pushing those sentiments to the margins in Scotland despite the media.
(English-born Edinburgh resident SNP member here, btw)