Did you check the two nipples on the plastic piece that goes into the top of the flame trap (as well as the hoses) to see if they were clogged. Be careful cleaning, if you have not done so, since the plastic nipples break easier with age. If clogged try running a stiff wire or small finishing nail thru it.

Less likely that breather box below the flame trap is clogged, but certainly worth taking off and looking at it. It is held by two hex bolts.

I find it worth the time to remove the throttle body to get to the flame trap and breather box. While I'm at it, I clean the throttle body. If the throttle body has never cleaned within the 160,000 miles, it should make a world of difference in idle and power. Won't help you oil problem, but may be part of your performance problem.

Gary