How early the ball revs up. Lower RG = the engine spins up sooner, so the ball stops skidding and starts hooking earlier. Higher RG = longer skid, more length. All four of your strong balls sit low (≈2.50), so they rev early.
How much the ball "flares" — laying down a fresh, dry ring of cover on every rotation. Higher diff = more fresh cover gripping the lane = more total hook and stronger recovery. 0.058 (Black Widow) is big; 0.030 (Rhino) is tame.
How defined the breakpoint is. Higher asym makes the ball stand up and change direction more sharply instead of arcing smoothly. It shapes the move; it doesn't create raw hook by itself.
The shell does ~70% of the talking. Solid + sanded (500/2000) grabs oil early and arcs. Pearl + polished skids long and snaps late — the "hockey stick." Hybrid sits between. This usually beats RG/Diff for first impression.
Oil = no friction = skid. The ball only hooks where it finds dry boards: past the end of the pattern (the "backend") and out by the gutter. More oil or a longer pattern pushes the hook later and weaker.