My experience has been similar with HBH and homemade, but I use WAY less HBH than is suggested on the bottle. Maybe a tablesppon per 2 gallons of syrup. It does cut down dramatically on mold in the buckets and plastic is much better accepted when sprayed with it. I also mix in some poultry electrolytes, but only about 1/4 teaspoon per 2 gallons syrup, so it may not really matter. MB is right...fullstrength HBH encourages robbing big time.
Buy locally, buy only humanely raised animals, eat in season, keep bees!