Again, to be counting in positive mode all the time, all you had to do was add an arbitrarily large enough number to the IRC of, say, -20, for 6 decks. That alone would keep you in positive territory throughout the shoe.

There is little logic to reversing how you count the high and low cards. That doesn't help keep you in positive numbers. In fact, it is counter-intuitive (no pun intended) to be getting more and more excited as the count is getting lower and lower.

Don