Trouble In Trebon, Part One

Armed with my all-powerful database and a whole lot of determination (and caffeine), I've started making my way through the Písek parishes in search of Johann Vanicek, born January 1867. I'm currently at twelve out of thirty-seven parishes searched, roughly one-third of the way, and still no luck. Now, I know I still have twenty-five to go, I'm just worried that I won't find him, and I have no further clues to go on. I don't do well with dead-ends, as I'm convinced they're just a matter of mindset and can be gotten around, but if this doesn't pan out, I don't have a back-up plan. I don't know where else to search from here. If this were Oma's side, I could step back and say, 'All right, I did my best, I can walk away,' but this is Pop-pop's side. He's the one who got me hooked on history, and I know being able to find this out would mean a lot to him. That means even if I could talk myself into giving up for my own reasons, I have to figure this out for his sake. Time for my usual eternal optimist to make a comeback, and convince myself that I'll find him in the other two-thirds of the parishes.