Mark,

I replaced the plastic OMP lines with ones made from steel brake line silver brazed to the banjo fittings.  SS tubing was not used because of its tendency to harden and crack when worked or vibrated.  The lines were embedded in a blob of silicone about halfway between the OMP and the nozzles to dampen vibrations.  These lines never leaked or failed in the 300 hours that they were installed.  If you happen to be using 2009 or later oil metering nozzles, be aware that the check valve in them requires from 45 to 50 psi to open which may be incompatible with older OMP's.

Those lines outlasted the engine.  After 300 hours, the engine lost compression and a teardown revealed chatter marks almost all the way around the housings, the chrome completely missing all the way across the housing in some locations which were very rough, matching rough wear surface of the apex seals, and partially collapsed apex seal springs.  Records kept throughout the life of the engine indicate the the OMP had delivered between 0.9 and 1 Oz of oil per gallon of fuel used the entire time.  Metered oil was a 50-50 mix of MMO and 2 cycle oil.  Almost all of the time on the engine was at 23" of MAP or less due to the 7200 ft elevation here. RPM was usually in the range of 5200 - 5500.   Fuel used was mostly 87 octane non-alcohol auto fuel with 100LL used on some of the cross country trips taken.  Static timing was set as recommended in the EC2 manual and left at the default programming value.  Maybe I just couldn't work the engine hard enough here?