On another forum where I am banned, Don S says there is no difference when splitting 7,7 against an 8 at TC +3 and up to TC +7, to go ahead and split. I think it was a DD, H17, DAD game.

Maybe I did not read it right or maybe I was playing it wrong. In any case, my question is how and when to split 7's against an 8 in a DD game, a 6 deck game.