I can't see the game link at the moment, and I'm not sure from what you'vre written if they discarded the 6 or the 8, but I think you meant the 8. My guess i the 6 is accepted into more sequences than the 8. 8 can only be in a 789 or 678, the 6 can be in 456,567,678 which makes it more dangerous.
If you don't have information on safe tiles or possible suji reads then throw terminals or honors, if you have none of those either throw 2's or 8's. If the wall keeps feeding you red 5's and doras it's not your game 😁. Losing is fun!