RE: .019-.029 sight pins
On most sights the bigger fiber will be brighter. Alot of folks don't like .029 for longer yardages....but if its low light your worried about, you won't be shooting a long ways anyhow (most likely). Probably if you have an.029 on your top pin (20 yd?) and you should be fine. On my sight I can see my top pinpast the time where I can see the deeranyhow, soI would think you should be fine.