Is there an adjusting barrel on the derailleur or on the lever or your frame's cable stop. If so turn it 1/4 turn at a time to adjust the cable tension. Screw it inward to loosen the cable, outward to tighten. I presume you've got rubbing of the cage against the chain while on the inner chainring and the largest rear cog? If so the cable need to be loosened. If the barrel doesn't adjust enough, then loosen the cable clamp again, let a couple millimeters of wire slip through, and retighten. Sounds like you did everything right, just need one more tweak.
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72