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As to the trying 3 different Powders, the three powders I was talking about were , 1 Goex FFg.... when I was in college my fraternity had a cannon that we would dry fire at home football games, and I brought it home and shot i a few times at a pig roast we had at the farm, when I did I had about four pounds left over.... The can had never been opened until recently and in the 10 years since it was purchased it has been stored in a dehumidified gunsafe so I assumed it would be fine, I dont know if the age has anything to do with it.... I also thought that maybe it was too course to prime with so I ground smaller amounts of it in a mortar and pestle to a finer grade to use for priming but that didnt help.
I also tried using Hogdon Pyrodex Muzzleloading propellant "P The FFFFg Equivalent", but was advised by someone in the club I am in that it wasnt what I wanted for a flint gun.... that it would be good for a cap gun but not flint
And the third powder i tried was some either FFFg or FFFFg (not sure which) that another club member gave me when I was having trouble and I said I wasnt sure if my powder was suspect or not. It worked fine in his gun that day but I only had about a medicine bottles worth and it did shoot some with the gifted powder but not perfectly.
As you were told, black powder substitutes are not idea for flintlocks. The reason is that Pyrodex has a higher ignition temperature than real black powder. So, it's harder to get it to go off with a spark.
While 4F or 3F may result in a quicker ignition, you can prime with 2F all day long. I do it with my Brown Bess where I am priming with the main charge as it all comes out of the same cartridge, just as it did in period.
Unless there is some reason to remove the touch hole liner, such as to replace it, it shouldn't be removed regularly. It is hard to tell from your pictures, but the threads appeared chewed to snot so I would recommend chasing them with the proper sized tap and making sure you have good threads before you re-install the liner. Last thing you want is to launch the liner out the side of the gun into someone.
I agree with others that the very first thing that needs to be done is a rigorous cleaning. There is clearly junk in that bore/breech. I don't know if your gun has one, but some guns have a "patent breech". This is where the bore gets smaller at the breech. What this means is your regular cleaning patch may not go all the way down to the bottom in that small patent breech chamber. You'll need a smaller tool to get down in there.
This thread seems to indicate you probably have a patent breech:
https://www.muzzleloadingforum.com/threads/patent-breech-in-investarms-cabelas-lyman-etc.88040/
Cleaning patent breeches can be a pain in the butt.
I recommend putting that breech end of the barrel in your utility sink or a 5 gallon bucket of warm soapy water and piston the heck out of it with a cleaning rod and a patch. That thing should be spotless. When you look in that hole with a flashlight all you should see is nice, shiny metal.
But eventually, you may get hard fouling in the breech and you'll need some kind of breech scraping tool to get down in there to remove it if water pumping does not do it for you.
You might wish to invest in a CO2 "ball puller". Generally much easier to use than a screw-type ball puller. You can buy CO2 cartridges in bulk off of Amazon.
Here is an example: https://www.3riversarchery.com/bid-co2-muzzleloader-discharge-kit.html