Hi Brick, I think you need to remove the honey frames that the SHB larva has invaded. Can you reduce your hive in size to allow the bees to be more protective? They are more effective with smaller spaces. If a 2 brood box, reduce to a single. And if it is a single brood box then reduce to a Nuc. Pick off all the larva you can find. Sorry to say those honey frames are no longer much use, the SHB larva leave behind a yeast that will ferment the honey and turn it to slime.
Here is Australia, we don’t have Varroa but the SHB can be detrimental to our hives, many beekeepers here lose their hives to SHB on a regular basis.
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