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Haven't worked with discount codes in years. Researching the ad copy I found very few sites putting the promo code directly in the ad copy. I thought this was a standard practice for increasing response.

Do you know why companies with active promo codes don't use them in Adwords copy?

To get more reviews, we email approx. 1 month after purchase.

Social media channels can help, too. Sometimes calling the reviews - "product feedback -- help us improve our products!" can appeal to a different segment of potential reviews. You can have fun social media contests around writing reviews of products.

Product reviews are a channel unto themselves, in my opinion. I do like the message board idea. I feel like message boards seem a little dated.