The six decker
For the six decker you described, assuming average penetration of 5/6:
Play-all, optimal 1-12 spread, $5 unit, $3K BR
<+1 - bet 1 unit, +1 = bet 2 units, +2 - bet 6 units, +3 - bet 9 units, +4 - bet 12 units.
EV per 100 = $11.35, ROR = 29.09%
Exit strategy, exit at <0, $5 unit, 3K BR
<0 - bet 0 units, <+2 - bet one unit, +2 - bet 3 units, +3 - bet 5 units, +4 - bet 8 units, +5 - bet 10 units, +6 - bet 12 units.
EV per 100 hands observed = $11.10, ROR = 11.05%
In your "Wow" post, you asked whether it was practical to use the exit strategy in a casino with just two tables. It would be tough. If you are under 21, there are good games in Michigan that you can play, particularly in the northern part of the Lower Peninsula and the Upper Peninsula. I don't know about other states that permit players under 21. There may be a few.