Totally get where you're coming from. I really recommend the Sam Harris "waking up" app. Really helped me and I think it appeals to the more skeptical and rational people you find on HN.
Is "waking up" significantly different from apps like headspace? What about "waking up" helped you so much?
Basically the principles behind meditation are explained at a much deeper level, and in a way that allowed me to transfer it more into my every day life. Headspace seems to just revolve around following the breath, whereas this is just a small chunk of what the waking up app teaches you. I recommend giving the free trial a go and see what you think.