The heatsink base doesn't cover my entire CPU, do I need to worry?
Don't worry.
On most central processing units (CPUs), the hotspot is in the middle of the CPU (on newer INTEL / AMD processors, slightly off center).
When designing each product, the bottom plate size of the heat sink is located above the hot spot.
So hot spots are covered, but not the entire IHS (integrated heat sink) and cooling is not compromised.