Perhaps you could look at circuit breakers for protection which you then dont have to replace?

You could get temporary-set models which will self-reset after a certain time, thus if you experience a current spike during a battle for whatever reason the circuit breaker may cut out for protection for a few seconds and then resume conducting afterwards, cutting out again if the current resumes to be at sufficiently high levels.

Only really a suggestion for an alternative to fuses as opposed to a suggestion as to the cause of your high current/too low rated fuses woes. Without a good enough description or first-hand viewing its hard to diagnose problems like this.