Yes, let's DO take a look
> Against a CSM you want the count to keep
> getting very negative not positive.
What you said is true, but you're not looking at it the right way. You're still thinking in terms of a "normal" shuffle, and you have to think outside of that box. Remember, with a CSM (and I'm specifically talking about the ShuffleMaster King machine here) the cards fed into the machine do not go to the bottom of the shoe, but are randomly (and therefore evenly, on average) inserted into the remaining, undealt portion of the shoe. Thus some of the cards just played can and will appear in the very next round
I have to assume you did not read my earlier post; so let me go through it again (using simple numbers and an extreme case to illustrate the point):
Assume: cards are fed into the machine 26 at a time.
Assume: The true count for the back deck of the 4D shoe is -6 and the true count for the front three decks is +2.
OK, the first 26 cards are dealt at an effective count of +2. This leaves the back deck in the shoe still at -6 and the front 2� decks at +2.
Now the 26 cards are fed into the machine. 2/7ths of them (on average) will go to the back and 5/7ths of them (on average) will go to the front. This causes the back, negative portion, to become slightly less negative and to become larger (by 2/7ths of 26 cards), but the front portion, which increases in size by 5/7ths of 26 cards, of the shoe REMAINS AT PLUS TWO!
Now the back portion of the shoe is 52 + 26 * 2/7 is ~59 cards in size, and the rich front portion is now ~149 cards in size. IOW, the lean back portion gainss ~7 cards, and the rich front portion loses ~7 cards.
Now another 26 cards are dealt and subsequently fed into the machine. Now the back portion is larger; so it will receive a larger proportion of these cards. Now it will increase in size to 59 + 26 * 59/182 = ~68 cards; and the front portion, which will REMAIN AT PLUS TWO, will be ~140 cards in size.
And so it goes. In this admittedly extreme situation, you could easily have 30 or 35 or even more (depending on the number of players at the table) consecutive rounds at an effective count of +2.
Thus your initial statement about the count dropping is true, but it has to be utilized in a different way to tell you what's really going on inside that infernal machine.