For my Le Page, I use a 0.465 ball as the barrel must have been rebored at some point and it mikes up at 0.48. 30 grains of Swiss 1 and a patch 15 thou x 1 and an eighth in diameter. As a rule of thumb, I calculate the patch thickness to be twice the difference between the barrel and ball diameters. It's stood me in good stead as the Pedersoli has shot 96 with the smooth bore and a 98 with the rifled version (10 shots all to count).
If you speak to Tarmo, give him my best wishes and I look forward to seeing him in Barcelos in August.

Don't try doubling up on the patches. You'll do better trying to find the right thickness (try Jeff Tanner at Tanner ball moulds).