Brush the cats

Nerve banks past your cap here, the same way a consumable does, because nerve refills on its own well inside the cooldown and a claim that clamped would arrive at a full bar and do nothing.

Why it banks past the cap

Nerve regenerates at 0.2 a minute, so a full bar refills in about 5 hours — comfortably inside the 8 hours between visits. A claim that stopped at the cap would therefore arrive at a full bar almost every time and be worth nothing, so brushing banks over it, exactly as a Catnip tea does. $50 for 5 nerve undercuts the Catnip tea on the market at $160 for 10, which is the only reason the visit is worth making.