There are no known B string issues with an L2500.This is my first L2500 so I'm not familiar with any particular b-string issues. That being said, I've never been a fan of the SIT strings. If I were you, I'd try something different. I've got EB Super Slinkys on there now and they seem to work fine. Still tweaking the setup.
I’ve been using Slinky 5’s on mine for 24 years without a problem.