Hi Luxcubed,
quite interesting to read that you got better results with de-noised and sharpened images, which are usually big no-nos in every photogrammetry guide. But I guess it always depends on many factors.
Depending on what kind of LOD you are after, 1900 images @ 22 mpx sound like not very much to me for a whole cathedral. But you said you have been using other tools before, so I guess that it should suffice for your needs.
The rest of your questions concern very basic GUI issues (it’s a bit quirky at first) which are covered very well in the in-app help. It’s a pain to use in search of something specific, but quite good for a first read. What isn’t in the help has been thoroughly discussed here in the forum. Also take a look at the FAQ 
If later there are any specific questions left, I’d be very willing to help - even to look at the image set if necessary. But I’m sure that you’ll figure it out, especially if you know what you’re looking for.