my car subs (2 Kickers) dont hit every note when volume is high...how can i fix this?

i have 2 10 inch kicker c10 subs...both of which suit my preference adequately...however when i turn up the volume to a rather high setting..they only hit half of the time. i primarily listen to metal...so when speaking in drum talk..the subs hit the double bass pedal parts only half of the time. i have a rather cheap amplifier rated at 720 watts..im wondering if maybe a more trusted brand(alpine etc..) of amp might fix the problem?? each sub peaks out at 300 watts rms. any tips would be helpful. thanks!
 
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