Sim Result
25-150 spread (1-6) No Cover , 55% penetration s17 ds double deck, Ideal Ramp $25 at +1 or less, $50 at +2, $100 at +3, $150 at +4
Edge 0.67%, Win/100 $25.82 SCORE 17.73
25-150 spread (1-6) Cover always leave previous shoe final bet out at the shuffle if the previous hand won. No decreasing bet after a loss
Edge 0.56%, Win/100 $23.84, SCORE 12.38
Avg Bets in negative adv or small + adv situations due to sometimes betting more than the ideal $25
+1 TC $33.00
0 TC $32.25
-1 TC $27.75
-2 TC $26.00
-3 TC $25.25
Summary
Costs you about $2 of your win rate per 100 hands played (about 10%) but due to the increased flux due to bigger betting your SCORE drops by a much greater margin.
Either way, spreading 1-6 on a 55% double deck game even with s17 ds rules is a bad bad game. SCORE of $18 is horrendous even for the no cover approach. Generally you need a SCORE of $35-$50 to be barely acceptable, $50-$70 SCORE would be good, and $70 or higher would be very good, and $100 or higher would be heaven.