The aluminium figure is rather high. Al will be from the top end, probably the block itself.
I would try moving up to a major brand full synthetic 0w20 and if the Al figures don't improve, try using Liqui Moly Ceratec to beef up the additive.
The OCI could be extended to 5K miles, as the Al figure is not high enough to cause additional wear, although the oil concerned is not one designed for a long OCI, as it has less than 2000 ppm of detergents (Ca and Mg). M1 has 3000 and one of the Amsoils has 4000 ppm of Ca.