[gk1]

Instead of speculating about what may or may not perform better, are you actually collecting analytics data? Are you tracking clicks on the AppStore link, the Register link, and all other calls to action?

Once you have accurate tracking set up you can A/B test many of the suggestions here (using something like Optimizely or Visual Website Optimizer) to see what works best. Otherwise you'll just be changing from one guess to another.

I do this sort of thing (conversion optimization). Get in touch and I'll be happy to give more pointers.

[rheotron]

I'm one of the other founders on this. We're tracking using mainly google analytics. Would love to take you up on this offer, mainly just to get your ideas on what tools are the best to use for this kind of thing (I've investigated a lot, mixpanel, kissmetrics, etc. and none seem to really do the job). What's the best way to get in touch?

[gk1]

Shoot me an email at greg.ny [at] gmail.com with a few times that work for you for a chat. GA is perfectly fine, it just requires some minor configuration to collect and report actionable metrics that matter most to you.