I can tell you how to get a reasonable idea of value of insurance by using the program on my website.
I am too lazy to do it for you but I can show what to do if you're interested. The trouble with math is that most just don't care to deal with it. Also I wouldn't be surprised if QFIT had some sort of data listed somewhere.
The program on my website computes composition dependent EV for any shoe composition. It also computes insurance EV at the same time. For insurance it computes 2 values - insure all and insure only hands where EV is positve.
Relative to a count the only problem is to input a reasonably representative composition. Since you're interested in 6 decks, the first step is to input 6 for
number of decks. Mid-shoe is the best place to compute values, so the next step is the set shoe composition to 12 for all non-tens and 48 for tens. Mid-shoe is good because I have independently shown at that point probability of drawing a neutral Hi-Lo count card (7,8,9) at that point equals exactly 1/13 for any running count.
Next step is to vary composition relative to Hi-Lo.
For a 0 count nothing needs to be done. Just click compute. Insure all EV displays -.2844%, Since there are no +EV opportunites for a composition of
12,12,12,12,12,12,12,12,48,12 (2-A) insure +EV displays .0000%.
To create non-zero counts change low card compositions (2-6) and high card compositions by equal amounts. i.e. to create a running count of +2 remove 1 low card and add 1 high card (T-A). Total number of cards will always be kept equal to 156. It doesn't matter which low cards are removed because relative to the insurance calculation they are all equivalent. However the insurance calculation is different depending upon whether the high card added is a ten or an ace. So the calculation needs to be done twice - once with 49 tens and 12 aces and once with 48 tens and 13 aces to account for both possibilites. The probability that the high card added was a ten = 48/60 and the probability it was an ace = 12/60 since the starting high card composition is 48 tens and 12 aces, so multiply insurance EV with a ten added by 48/60 and add to insurance EV with an ace added multiplied by 12/60. Result is insurance EV for running count of +2 with 156 cards (3 decks remaining,) evaluating to a H-Lo true count of +.67. For reference this comes out to -.2179% for insure all EV and .0000% for insure +EV.
Next compute EV for 2 low cards removed and 2 high cards added. This is a running count of +4 with 156 cards (3 decks remaining) evaluating to a Hi-Lo true count of +1.33. I will not do this calculation but will explain waht is involved. It never matters which low cards are removed but now there are 3 possible combinations of high cards that can be added - TT, TA, AA and 3 calculations need to be done. Prob(TT) = 48/60*47/59, Prob(TA) = 48/60*12/59*2, Prob(AA) = 12/60*11/59. Sum the 3 calculation results for each of the high card compositions multiplied by their probabilities.
Whenever compositions are chamged in multiples of 5 low removed : 5 high added then only 1 calculation is needed. This is because the correct ratio of tens to aces can be maintained by simply adding 4 tens and 1 ace, 8 tens and 2 aces, etc.
What you will end up with is a table like the following. I listed end results for
TC=+3.33 and TC=+6.67 because they involve changing composition by multiples of 5 cards and require only 1 calculation.
You could use a program such as Excel to do the probabilites for cases of composition changes that are not in multiples of 5 because that could be a pain in the neck to do by hand.
Online program to compute blackjack EV
Insurance EV at various Hi-Lo true counts for 6 decks at pen of 156 cards
0 Insure all -.2844%, Insure only when +EV .0000%
+.67 Insure all -.2179%, Insure only when +EV .0000%
+1.33 compute yourself
+2 compute yourself
+2.67 compute yourself
+3.33 Insure all +.0269%, Insure only when +EV +.0369%
+4 compute yourself
+4.67 compute yourself
+5.33 compute yourself
+6.67 Insure all +.3763%, Insure only when +EV +.3763%