Problem with IFR outside controlled airspace is that although you maybe on radar service, the other traffic may not be. I was once vectored away from unidentified traffic only to have the other contact start a series of course changes which always seemed to target me, no matter what heading I was given.
Slightly alarming - it was almost better not to know what was out there and play roulette with avoidance (which is what the IMC rating is).