Gearing for Hyper 7

For my hyper 7 conversion, I'm going to make a change from my current set up. Which is an ofna 51t and 12t pinion. I'm thinking about using a Kyosho 44t spur gear. What pinion I should start out with? I'm hoping that the smaller spur gear will give me a little more room. I'll be using a 540c 9l and 4s packs and a Quark 125B. Thanks in advance.