I currently flat bet except when I am in a 1-2 chop. Then I play a simple 1,2 negative progression. This is very low risk. If you are flat betting, you make 1 unit on a single and 0 on the 2 iar. When you finally get the 3 iar you lose 2 units. When you use the 1,2 progression, you make 1 unit on the singles, 1 on the 2 iar and lose 3 on the 3 iar.
Example: Shoe: 1, 1, 2, 1, 2, 2, 1, 1, 3
Flat bet: 1, 1, 0, 1, 0, 0, 1, 1, -2= 3
1,2 Progression: 1, 1, 1, 1, 1, 1, 1, 1, -3= 5