I developed one system that sorta works here in GA. It has streaks of hot and cold (more cold then hot) but with some thought process, it might be worth consideration.
First, I track EVERY possible pair that can be made with a cash 4 number. I have my formulas setup such to eliminate counting duplicates (in the case of doubles, triples and quads). Now, I currently only track the HOT numbers. Honestly have not even looked at the cold numbers. Then, I take the top 5 numbers for Evening and Midday for ALL games and for the past 60 games. I use all games to give me reason to consider the most favorable recent numbers listed with the past 60. Whenever one of the more recent numbers reflect a number on the same line as all games does, they tend to show up. Now, had I encompassed 10 top pairs, I would have had a hit last nite (16 was ranked #8).
Next, I subtract the last 2 numbers that fell for that game (midday to midday, evening to evening). In this case, it was 2692 minus 4291. The result is 1599. The first 2 digits is 15, the second pair is 99 (someone may want to take this a step further and use a plus/minus 1 on each position as coming up with a usuable set of numbers to work with). Combine 99 with 16 would have given 9916. Last nite's number was 6991. Now, like I said, this number did NOT show up because I only track the top 5 hot pairs. The reason for this is because the top 5 hot pairs, when combined with Evening and Midday sets creates 20 numbers. The top 10 would create 40 pairs which is far more then I care to deal with. Sure, I would have won $200 for that $20 dollar play (assuming 50 cent box), but I still do not have confidence within my number picking capability to go to that extent. Also, this system is intended to only play box form.
Now, because I also incorporate several other methods, I use this chart to compare against other charts to try to find winning combinations. Anyway, you asked, I hope this is usable for you.
Sir Metro