The "standard" Rick's reg will allow voltages as high as 14.9 V, and his lithium specific reg limits the voltage to 13.8-14V. I'm not sure about your WPS battery and it's chemistry (Lithium Ion vs Lithium Iron), but the Lithium Iron (LiFePo) batteries I've used recommend 14.4 Volts. Higher voltages will reduce battery life, but Lithium Ion batteries can fail violently if over-charged.
Oregon Motorcycle Parts makes an adjustable regulator.