BAT amp users - any fuse recommendations?


I have a BAT VK-55, OEM fuses, curious if other BAT users have experimented with after-market fuses, and if so, any recommendations?  
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I use Synergistic Research Black fuses in my Rex Monoblocks, Rex preamp and I love them.  I think they are worth the relatively modest investment.
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I put on (6) HiFi Tuning Silverstar in my BAT Vk-600se, the difference  compared to OEM fuses was apparent but not that spectacular. I talked to Victor Khomenko and he was not recommending the use of after-market fuses ...