Which FSD module stats setting do I need more or less of?
The module
size is important. For the FSD, you want the module size to match the module 'slot' size.
On a Cobra Mk V (which is the single best ship in the game, IMO), the FSD slot is a size 4. You can put smaller size components into the slot, but you can't put larger size ones. When it comes to FSDs, putting a size 3 FSD in a size 4 slot will only give you stupidly low jump ranges. In this instance, you
need a size 4 FSD.
The size is denoted by the number, the quality of the component is indicated by the letter. A 4C FSD will
always be better than a 3C FSD. Change it.
If you have the funds, a 4A FSD will give you the best jump range. A 4A SCO FSD is preferable, as SCO FSDs have both the "wheeeeee!" button you found out about yesterday, and better jump range.