I run an education product.

I'm getting around 0.81% on the remarketing campaign over the last 30 days but conversion rates are crazy -- I'm getting triple the normal conversion rates.

I don't know if the CTR is a good one but compared to normal display campaigns where I get around 0.20-0.27%, it's a much higher CTR than what I usually get

Well 100 impressions is nothing. You need a lot more impressions to get some clicks. As John has suggested, try increasing your bids.

A retargeting campaign can certainly be successful with a compelling ad even if the small audience size is small

I have a client who wanted to say thank you to a list of 80 high value customers. So I cookied these customers and displayed thank you images as part of the remarketing campaign which got great feedback