Hi-Fi Tunig Fuses & Parasound A21

Hello,
I am thinking of replacing the stock fuses of Parasound Halo A21 and have a couple of questions for this audience who have hands on experience with fuse replacement.
1. It seems to me that the main fuse which is in the signal path would be the most important fuse to replace and would yield the max improvement in sound. Replacement of the 4 internal fuses in the rails not being in the signal path might be optional. Would you agree?
2. My fuse options are Hifi tuning Supreme and Synergistic Quantum Black. I read rave reviews of Hifi tuning fuses used in Halo A21 but not so much on the new Synergistic Black fuse. Did anyone have an opportunity to compare these two fuses?
3. I tried cleaning the main stock fuse with DeOxit Gold contact cleaner and the result was a very harsh sound as if the fuse was not broken in. I have also found that the sound changes with the direction of the fuse. In one way it is relaxed with a very clear mid-range specially the voice with a little loose bass. The reverse direction produces a very fast, punchy sound with a controlled bass but it had a tad hazy mid-range specially the voice.. I wanted to get both but it is not possible at least with the current stock fuse. Did anybody experience this behavior with the direction of the fuse be it a stock or an expensive audiophile fuse?
Thanks

Thank you. I have just bought one Hifi Silverstar for the main fuse. Will try it and let you all know the result.

@auxinput- I ended up ordering Hifi Tuning Silverstar (the main fuse) and Classic Gold (rail fuses) which are on their way. I would first try the main fuse to see if this improves the sound at all. If yes then I would replace the rail fuses. I would post all result hopefully by the end of next week.
I wanted to find if folks here have an idea of how much changing the rail fuse would contribute to the overall improvement in sound under the assumption that changing fuse improves sound quality. Any feedback would be greatly appreciated.
Also did anybody compare performance across Hifi Tuning (Classic Gold, Silverstar, Supreme) and Synergistic Research Quantum Black fuses?

Thanks.
Indranil

@toolbox149
I have replaced both the main and the 4 rail stock fuses of my Parasound A21 amplifier with Hifi tuning fuses. I replaced these fuses in sequence. First replaced only the main fuse by Hifi Tuning Silverstar fuse and it immediately improved the sound in all areas. What I liked the most is the blacker background and the improved clarity. Not sure how it dropped the noise floor but it did.
Then I replaced all 4 rail fuses with Hifi Tuning Gold fuses (couldn't get the Silverstar in 8A rating) with the arrow pointing to the flow of the current i.e pointing from the transformer to the capacitor. The result wasn't so impressive. While it further increased the clarity but the instruments started sounding very hazy and smeared. The overall sound was also veiled. It has been 20 odd hours since I replaced the internal fuses and they might still be going through the break-in interval. I tried flipping the fuses such that they point to the transformer to see if that resolves the haziness issue but it didn't.
Did you have similar experience when you replaced the rail fuses inside your amplifier? Did you find any break-in period with these fuses? Any feedback/help in this regard would be greatly appreciated.Thanks.

@Toolbox,
All my components are solid state. No tube so far... it's about 36 hrs that these gold fuses are added to the amplifier and the haziness specially with instruments and drums continues. The overall sound is still constricted which is expected during the break-in time but the haziness i am not sure. I will continue running the amp another 36 hrs and then start changing the fuse configuration. will definitely try the layout as you suggested... If this haziness continues with the gold fuses with all or any combination then they have to go. Unfortunately Silver star fuse in 8 Amp is not available anywhere except Music Direct which has only two offered at the full price. I have ordered a set of 4 Synergistic Research SR fuses which will be delivered early next week. So after 76 hrs or so if the current combination of all gold fuses doesn't improve the sound most importantly cures the smearing of the sound I will try other alternatives including what you suggested and also the SR fuses in the amplifier. I will keep you (whoever is interested) posted.
Thanks.