Double on A,8 vs 5,6 at the same point that your system tells you to stand on 16 vs T. (and this is also when you would double 11 vs A, and 9 vs 2). Double A,8 vs 4 at the point your system says take insurance (you should also be standing on 12 vs 2, and double of 9 vs 7 at this point).
Even if the count is high enough, please don't split your Tens.