brownsfan,Thanks for the info. I ordered another SR BLACK 3.15A fuse today.
I see the labels now. I guess the coffee didn't kick in this morning. :-) I'm going to use SR BLACK in HDD live and move the SR RED from PS 9.0 to Mains Live. I replaced my full loom of SR REDs with SR BLACks. Since you didn't hear much improvement in Mains Live, no need wasting money on another SR BLACK.
I asked Dan Wright many questions too. He only mentioned the fuse in PS 9.0 so I thought none in HAPZ1. I'm glad we have forums to share info.
BTW, since PS 9.0 also uses a 3.15A, you can try SR BLACk in HDD live, stock in Mains Live and SR BLACk in PS 9.0. The correct fuse direction in PS 9.0 is rear to front.