Double Down on Soft 12

[Gronbog]

have a similar question too. one of the online bj i play here in asia, they allow you to hit or double down after split aces but not re-split them. should i double down when the dealer has 4, 5, 6?

You don't state the rules, but for using 6D S17 I get the following indices to double A,A when you can't split:

A,A vs 3: +9
A,A vs 4: +4
A,A vs 5: +1
A,A vs 6: 0

For 6D H17, I get

A,A vs 3: +8
A,A vs 4: +4
A,A vs 5: +1
A,A vs 6: 0

These data were extracted from the sims I ran to generate indices for the upcoming book from Don and I. Too be fair, though, these specific plays are not discussed.