I always use a double dash in addition to all three boosts. Average is probably around 20-25, have gotten as many as 40ish. I like chapter 2 level 15, very simple so easy to go fast. Chapter 8 level 6 is the best for coins but for gems galore it's all about how many customers you can get through.
Finally got a gems galore bonus the other day in Daily Goals, ended up with 16 gems playing chapter 2 level 15. I did use boosts but wasn't playing in top form Will try that again next time I get one of those bonuses.
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