Depleting your iron stores (bloodletting should do that) could also alleviate gout.
So your SUA tested at 0.41 on 100mg allopurinol and 0.29 on 200mg? The drug seems to be working but another uric acid test will be required to confirm that your latest result isn’t a fluke and that UA-lowering treatment is a success.
I’m not aware of any hard evidence that lowering your uric acid further would be beneficial. It would make sense if it was marginally beneficial but has so far as I know only been shown to be beneficial when people have visible tophi.