Hi Fi Tuning Supreme fuse-Burn In?

Question to the OP. Given some "break in" time has passed, has the sound opened up or become more smooth? I have just put in a hifi tuning supreme fuse into my tube phono preamp a couple of days ago and I'm experiencing the same observations. Sound is much clearer and more detailed but somewhat thinner and a little bit too aggressive in the highs. My cart is an AT which is on the bright side and the change in fuse has highlighted this trait.

Thanks for the response and suggestion on the SR blue fuse David. I have quite some time to go then as my guesstimation is that I have about 25 hours on it only. I’ve switched the fuse direction 4x and I’m pretty sure it’s in the right orientation. I’m getting much clearer and neutral sound but some vocals seem compressed and the bass got tighter but lighter. When I switched the fuse to the opposite direction the highs become almost unbearably sharp. These are my observations after listening today. 

Its my first fuse upgrade so wanted to get my feet wet so to speak with a moderately priced fuse and hear for myself if there is a change. Still hoping it will smoothen out as it burns in as I’m undecided if I like the change that I hear. 

Thanks for the tips. Will try to experiment, who would’ve thought that this tiny fuse change would result in an exercise in patience. 

Out of curiosity I swapped out my interconnects to a warmer kind (van den hul) and all of a sudden everything clicked. My phono stage with HFT supreme sounds great now, the highs are more tame and it sounds "right".