Simplest of answers: you're doing something wrong. Start with Red 7 for DD. Choose rules, number of players, 50% pen and 1-8 spread. Make sure to manually adjust the minimum bets. Get your SCORE. Now, leave everything alone and go up to the Compare field in the red menu. Choose Unbalanced Zen II. You should see the SCORE improve by a couple of bucks. (The RORs for the two should be identical, at around 13.5%, if you play optimally).

Don