Thicker oil won't help your problem - it may reduce oil consumption if you have bad bore / ring / valve stem wear, but 10W60 is way above spec for these engines - especially in a cold climate like the UK.
Also running the engine oil level @ minimum has its own problems when it comes to hard cornering oil surge and aeration.
Bite the bullet and replace the AOS, thoroughly clean out oil resedue in the inlet plennum and see how that transpires. If the worst comes to the worst, a compression or leakdown check will give you some clues before tackling (expensive) cylinder head aux oil pump problems.....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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