We have problems with large drawings too. We often do drawings of assemblies with 1000 to 1200 parts and sometimes it will take a couple of minutes to generate a drawing. I had the "views aren't precice..." problem a while ago, (I think it was back in 5.3 or 6) but Autodesk couldn't...
Its fairly easy to learn. It took me about 2 hours to pick it up but I had been using Pro Engineer for 3 years. One of our draftsmen went from AutoCAD to Inventor and it took him 6 weeks to get confident but then again another one of our draftsmen went from AutoCAD to Inventor in a couple of...
You could try a tangent constraint. If you click on the "place constraint" button, under the "type heading, go to the 3rd button across which says tangent and then click on your surfaces.
I hope this works for you.
Andy