Zoom- no problem,
On the loose rear end you may try more rear toe-in, you can go to far and increase rear tire wear and cause the car to slow down in the corners ( it won't roll free) I used to see this when racing 235mm Seprent Impacts in 2wd. The car just slows way down in the corners it will stick like glue but won't carry as much speed through the turn.
Or try some different dampening and spring rates.
On the Issue of Car Action it is the fall touring car issue.