First of all the pen for the DD game is excellent and trumps any rules deficit you might have. Co-Variance makes two hands a much more attractive play as you can increase your EV while not increasing your variance. I believe the forced two hands at negative counts is worth the extra variance due to the deep penetration offered. Especially if they only require one of the hands to be $50. Normally, 2 X 50 would be required. You will get more positive count rounds with this penetration and they will be strong.

Two hands can also provide some level of betting cover in positive situations as the hands bet amounts do not need to be equal (does not change ev or variance) and you can use that to obscure the ramp.

Be careful, DD is the counter catcher and very difficult to hide you ramp. Short sessions. Do not camp out on this one.