i've messed with boutique fuses in the Extreme, a few spendy ones, a friend sent me a nice one to try. they seemed to make a very marginal performance uptick......'seemed to'.
however; where i live i get power outages from time to time, nothing too bad. but
EVERY time i got a power outage each boutique fuse blew......
EVERY time!!! $$$'s go poof!
stock fuse has never blew once. lots of stuff going on in the Extreme. no more fuse experimentation for me. i have a few 'special' fuses in my system in few spots, that have been there for almost 10 years with zero issues. so it's not my system/power grid particularly.