My pool has 3 trees that hang over it, and as a result lots of leaves fall in. Does this increase my FC demand due to all of the organic matter? If so, should I aim for slightly higher FC levels, or just stick with the normal levels?
This is a very important point about skimmer baskets. Not emphasized enough. Especially during SLAMYour minimum FC level remains the same no matter how many trees are dropping debris in. The amount of bleach needed will vary with the organic load. You'll have to discover by trial-and-error just what the demand is for your pool. If you read 3 and your minimum is 5, and you add enough bleach to get to 5 and the next day you're at 1, you need to target your minimum (5) plus your loss (4) and raise FC to 9 each day. Or whatever your particular numbers are. That depends entirely on your CYA level and your daily losses. Also remember that once people start swimming, your chlorine demand will go up.
The sooner the leaves are removed, the less chlorine is used up trying to oxidize them. But also remember that leaves caught in the skimmer and strainer baskets are still in your pool water, even if they're not on the floor of the pool, so empty them often.
Keep a little log on a notepad or your phone and you'll pretty quickly see trends and establish a baseline, assuming your cya is stable and you aren't adding any.