The way they use the Buhlmann algorithm as the basis for their dive computer algorithm is exactly like any other dive computer manufacturer on this planet does with adding their own magical touch to the base algorithm that they don't tell you about exactly. ALL of dive computer manufacturers add their own fudge factor to the base Buhlmann algorithm and SP is no different. There is no mystery or issues with it at all just like Oceanic, AL, Ratio, etc. do to their algorithms. You don't know more about other manufacturers dive computers' algorithms than what you know about SP's algorithm.