Tuning with Delta Force Sniper software, i need help understanding it!

Hi guys, im tuning my 99 mustang gt using sniper software, i have a loaded tune for when my engine was stock, i now have ported and polished heads, mild cams and a tad bit higher compression (stock was 9.5:1 and now have 9.7:1 due to the machine shop having to deck the block).

Any insight on how to use the fuel modifier and spark modifier will be greatly appreciated.

Why did you buy that instead of SCT or diablosport like everyone else uses?