It's a 500/1500 OOB, so to get it to go straighter I would go 500/2000 or even 500/3000 with polish on both counts.
It's a very similar change as to what I did with my Pit Bull, which is 500/1000 OOB and is way too much for a THS, so I went 500/3000 with polish and that turned out to be the perfect change.
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