I have a rifle that was built about 25 years ago, and the touch hole was off center like yours. It was fussy about ignition, and I tried enlarging the touch hole, but that really didn't help. I used a Dremel to widen the pan so it was more centered, and that was a big help.
Is it just the angle of the photo or is the hole below the top of the pan as well as being off center?
Do this: measure the distance from breechplug to the muzzle with your ramrod. Now compare that length with the position of the touch hole. I like the touch hole to be about 1/8" ahead of the breech plug.