While it's good to keep the min radius of the staging area the same as the rest of the layout, you also have to remember that if your min radius out there is more for realism (as in, looking good), you can get away with a lesser min radius in staging because nobody really sees the huge overhangs there. Unless, of course, you have visible staging.
As long as the min radius in staging is equal to the min radius recommended for the equipment, you should be OK. Out on the main line, your min radius should be greater, so the trains 'look right'.
Kennedy