You are asking about an EV maximizing index. 10vT is the most important RA index. The play is pretty much based on ace density. Without an ace side count I wouldn't go there. The EoR of the ace is about twice the EoR of the T. The T is almost 50% higher magnitude than the low card group's average. The 7 EoR is about twice as much as the low card group and about 50% more than the magnitude of the T. EoRs (2-A):
(-1.9307, +0.5811, +0.55844, +0.6370, +0.8799, +0.8810, +1.6360, +0.8464, -0.0494, -1.0164, -1.9307)
That is the EV maximizing definition.
Yes.
We would need to know your count system to answer this, but 10vT is by far the most important RA index. I wouldn't double without strong ace information. Add 7 info to that and the index becomes much stronger.
Here is a link to a Hilo EV chart for 10vT. Just pick your rules and 10vX:
https://www.card-counting.com/cvcxonlineviewer3.htm
The high adjustment for RA play says at the lower EV maximizing index you will be making a lot of actual negative EV doubles due to poor correlation of the count to the play. Either gather better info to fix the correlation of info used to make the call, or use the RA index, or be prepared for a wild ride for small gain in EV between the EV maximizing index and the RA index.
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