The following questions are in reference to The Snyder Profit Index on page 121 of Blackbelt in Blackjack. For those of you who are not familiar with it, it is an index used to quickly rate whether or not a table is worth playing based on table rules, number of decks, and number of players at the table.
After adding up all the info, here is how to use the scores:

Above 50 - Play all (no wonging necessary)
0-50 - table-hop only
Below 0 - A waste of time

Note: I don't think that Snyder in all examples means to say whether or not a table is "winnable" by this method, but rather whether or not it is worth a player's time.

So I have computed the information based on 6-Deck and 2-Deck games in my area. There are only 4 casinos with tables that are worthwhile. When you add all the tables in the casinos, about half are above 50 and the other half are form 0-50. However, NONE of the tables in these casinos have a score above 50 when the table has 5-7 players.

Normally I don't wong in, but I do wong out. Therefore,

Question 1: If I am in a situation where wonging becomes necessary to not waste time according to his index, would the intention of wonging out be worthwhile or do I need to wong in as well (provided that his score is between 0 and 50)? I prefer to begin each shuffle, then wong out if things go negative. I do this because I believe that wonging in would be obvious in these casinos due to their size. I rarely see people watching from behind any table. "Wonging" in this case may simply mean going to the bathroom, pretending to take a phone call, getting something to eat, or switching to another table.

Question 2: All the numbers that I ran assume that I am spreading 1-8 on both 2-deck and 6-deck. However, I would like to begin spreading 1-12 on the 6-deck. This would help the Snyder Index results in terms of making it more worth playing. That would require me to be playing $100 chips since 1 unit is $10 for me. Blacks always get a "checks-play." I know that checks-play doesn't necessarily mean heat, but I have been playing at these little joints for a while and few people bet blacks. When they do, the pit watches a little more.
So, I was reading that if you want to play 2 hands, if the count calls for an $80 bet for example, you would not play 2 hands of $80 each for a total of $160. You would play a total of $120 by playing 2 hands of $60. I'm sure this is probably due to covariance.
I believe that 2 hands of $60 would get less heat than one hand of $120. This is based on what I have read and my own experience with the casinos. Obviously this would only be done with high counts. What do you think of this strategy and would you recommend it?

Question 3: Referring to the info in question 2, would this example be considered a spread of 1-12 with $10 being only one unit or would it be something different? I don't know what to consider the spread to be when playing 2 hands. If the total bet is $120, then to me this means that it is a 1-12 spread.