Fuses fuses fuses

From my experiences using the Synergistic Red and Black.  The black was more detail then the Red, but on some equipment i prefer the red better than the Black.   The black can be overly aggressive and bright on some of my unit.  As far as directional wise,  Peter Hanson at SR states that you should try it in both directions, there is not a wrong or right way.  I came and visit his place down in Irvine just 10minutes from where i live.   You just got to try it out and see what works for you. 

Here is my dilemma: I notice that with the SR Black & Red which i have on most of my equipment; I have one in the amp, preamp and cd player. Man... ever so often these fuses would blow out on me. Should i up the rating say from a 4 amp to 5 amp?   Also, in regards to warranty, are the fuses cover under a 5 years warranty from Synergistic ( according to their website). I went and did a search but it only mentioned other accessories but not fuses. Any members who had the same experiences with warranty would want to help me out on this?   I did call them and they stated that it's only a 30 days warranty. I am out of luck? I am not too happy with their customer services!