If you still have a fear of persecution, is it because you were targeted explicitly by the government, or is it because of a lifestyle you lead that is not accepted by society there? If you fear the government, definitely do NOT use the passport of that country. Renounce your citizenship and get a visa. If, on the other hand, you are ok to go there as far as the government is concerned, go ahead and use the country's passport. Your US citizenship will be safe for the most part. If something goes wrong, but your original asylum claim was not fraudulent, your citizenship will be safe at that point as well.
Best of luck.
*** El Cafe ***
N400 - NYC (Brooklyn)
March 12 2010: Sent
April 7 2010: FP done- walk-in
August 3 2010: ID decision not made
December 12 2010: Lawsuit filed under 8 USC 1447(b)
March 31 2011: 31 Oath date
April 1 2011: Passport applied, picked up!