Probably ECR, but interpreting my views in a European context is weird. Where would a pro-immigration social conservative go?
If you're pro-Europe, EPP most likely. But if you're pro-immigrant and mildly eurosceptic as I would tend toward, it's a bit harder for a fit, though I'd go with ECR since the governance/sovereignty issue would be primary in this context.
I'm also some what eurosceptic (which as an American seems like a ridiculous thing to say). I'm not sure someone with my views could really exist in a European context, but as stated, I think the ECR would be the best choice. Maybe I could be an ECR supporter if my European self was anti-immigration.