I just picked up those fuses from RS a few minutes ago at lunch. Also picked up some inline holders and some 20 amp fuses for the inline holders.

I am going to try the 15 amps first, hopefully that will be enough to get me in the 4000 RPM range on my high speed pulley. Not as high as I would like, but probably a bit safer for the 1100 watt motor.

A bit confused on the foil, why were you using the foil? So the 5x20 15 amps work well enough for you?