That is a good question. The problem is with a Reel Touch the SB, SG, VS and the hard drive must be paired correctly to operate the machine, so you are limited on the usable SG combinations because of the harddrive load.
I have a bios 2 duck and the credits roll up slowly until about 2000 credits then it rapidly adds additional credits. The Duck is the only Reel Touch that I have seen do this. I have another Duck with a different load and it does not roll credits rapidly. Tabasco, Munsters, Bucks, Larry, etc all roll up credits painfully slow. Just press any button and they will immediately credit all after a win is the best advice I can give.