I write my games down, on a note pad. I sit here at some point everyday so I can just look and see when the next game is. Easy to do a week at a time.
Delete the old GM files and lines files before you download the new ones, then when you load the new GM file into the Editor you will have your last lines.
Chemisty? I do think there is some chemistry written into the sim tiny little brain, and it is not the same thing every year. Well maybe that is because my team usually changes quite a bit from year to year. But it seems what worked last year, doesn't work as well this year. But will work again in 3 years. So ya....good luck