I know the feeling…we just drove across country on icy I70 in a 2006 outback and we were fishtailing like crazy while cars were passing us at 60 mph. I would trade this thing in a minute.
I have a 1996 subaru legacy wagon (AWD 4 cyc). It has the same tendencies as your subaru. It will actualy break loose in the rear end if I help it, or in the right conditions. My shocks are in need of replacement in the rear, so I am assuming this is a contributing factor to my problem. I find if it does break loose in the rear end, it will follow the front quite well, due to the front being the primary drive, and the rear being secondary.