It's impossible to tell, because we have no clue about your project's resolution.
Furthermore, if you're relying on those little pea-shooter FCP viewers as your only source of information, you're at a great disadvantage. You can NEVER, EVER judge video quality using an FCP viewer. You absolutely MUST use a video monitor.
So are you using a video monitor?
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA