werty,
Fuses is to protect the car from dangerous situations caused by electrical chaos, short circuit, equipment failure, excessively high current draw. If you put in higher amp fuses, you run the risk of 'cooking' the car's wiring circuits if something goes wrong because the fuse wouldn't "break".
I would look into installing a voltage regulator or something similar to keep the current at bay.
" I am a nobody, and nobody is perfect; therefore, I am perfect."
My bumper sticker "If you can read this...I can slam on my brakes and sue you"