I’d be curious to the answer to this too. I recently did an American Wheat lightly hopped with SA and 2oz of fresh orange zest added at 5 mins. I got zero orange flavor or aroma with that much, so I’m not sure how much .3 oz will provide, although I would suspect lemon zest might be a little more potent. However, the SA in my wheat did give me a very pleasant lemon note to the beer and I would use it again for sure.