Another question I have is this, the TC manual shows a minimum load of 80 grains using a conical. They don't have any information for using PRBs.
Unless you're referring to a special manual for inlines that came with your Omega, TC's manual entitled:
"Shooting Thompson/Center Black Powder Muzzleloading Firearms" does also have a section of load data tables for patched round balls.
There's a long established rule of thumb for PRBs that uses "caliber size" for general plinking/target/small game loads...examples I use are:
.40/.45caliber = 40grns Goex 3F
.50/.54caliber = 50grns Goex 3F
.58/.62caliber = 60grns Goex 3F
These are usually very accurate, and certainly all that's needed for paper, cans, pine cones, etc for 25-50 yard shooting.
Bump them 10grns for 100 yards to keep a somewhat reasonable trajectory at the longer distance.