My take is I think we should only work from the following categories: IP, K, BB, HR, GB, and possibly XBH. IP should only be included if we have a natural deterrent for SP steaming (such as weekly SP rosters, negative points for bad starts, a low IP limit, etc). I think our weights should be reflective of those for FIP, with some tweaks if we add variables FIP or xFIP don't use.
I understand I may be in the minority, but this is where my vote will end up.