On my BHK 250 I used the SR Black on the power inputs and HiFi Tuning Supreme (black) on the rails, and, boy, did it sound better! (The SR Black were on sale about 2 weeks before the Blue came out, so I just ran with the Black. And they’re fine.)
Paul said he was going to try better fuses on the rails,d but I don’t know if he did in between the move across the street. To me, the fuses made a big difference, enough to think I didn’t have to buy the 300’s.