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Have you tried Rislone, Lifter Medic (my fav), or Marvel Hi-Rev? They're all engine flushes and do well for clearing lifters and rings. I usually recommend three applications at 1,000 mile intervals. Follow the directions exactly! I've unclogged lifters and stopped some engines from smoking (stuck oil rings.)
If a reduction of oil weight helped, you probably have a varnish build-up. A couple oil changes is a heckuva lot cheaper and easier. And fix those leaks so you can use 10w30. If you're set on using synthetics, have you considered half and half? Many times that will give you better oil control without resorting to heavier oil.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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