Looking good. When I’m working the ‘kinks’ out of a new gun I go with a light powder charge, maybe 35 to 55 grains in a 50 caliber like you have. Less fouling, easier on the shoulder and powder lasts longer.
To load easier with what you have, try a wetter patch. You can make a moose milk or maybe windshield washer fluid (I would avoid the Rainx, believe it leaves a film). If it doesn’t work, use it in your vehicle.
And your comment about cheaper being just as fun, your initial investment might be more economical, but cost of powder, patch material, flints lead/roundballs etc, puts everyone on pretty even ground.
It’s always fun, at least for me, to watch the ‘new guy’ go from zero to the top of the learning curve. Keep us posted on your progress.