Hey guru,
Since you have portfolio margin, I would look at cross asset relative value plays. I believe this is where a lot of alpha lies in the modern times. Model RUT vol on SPX for example. Look at ALL etfs. I have seen a couple get out of line. However, (for me) in Canada it's hard to take advantage since we do not have access to portfolio margin. VAR (vector autoregression) is your friend. I have found countless opportunities using this website(IB displays a more in-depthversion) research
https://www.etfrc.com/funds/overlap.php.
Hope that helps.
