Cleveland
A cheap fix to your hard trigger. Remove your grip panels. At the top of the grip frame, you'll notice there is a coil spring that attaches to studs on each side of the frame. It's the trigger return spring. Un-hook the spring leg from one of the studs. This will make a big difference in your trigger pull. I have owned about a dozen Blackhawks over the years, and it has worked well on all of mine. You are right about the 50th Flat Top. They must have taken a little extra care in that one. Mine is the smoothest out of the box Ruger I have shot.
As far as holsters, for a rig that heavy, I would look at a good shoulder holster. I had one made up by El Paso Leather years ago for my scoped Redhawk that works well. I have a similar nylon Uncle Mikes rig that works, but it is stiff, and uncomfortable.
Larry