If you are already re-qual'ed for CP on US, then why not re-qualify for 1P on UA? If you can get flights on UA metal (hard to do out of PHL, I'll bet), you would get some 500 mile upgrades and have a decent chance of them clearing by being 1P. Otherwise, ditch the UA (since you can get E+ seating on UA metal with CP) and go for EXP.