The stock HR50 is too muddy for this sort of speed metal, the riffs just becomes blur if the sound isn't sharp enough.
I high and low pass filter most profiles, but especially higher gain metal profiles benefit from a high pass--and the same is done in the studio or FOH. You might try adding a high and low pass filter at ~80Hz and 9kHz. Also, you can try pulling a little out around 200 Hz and/or 400 Hz to clean up any boominess and further tighten palm mutes. Another trick, besides putting a boost in front of the amp, is to use a compressor in front of a moderate gain amp to maintain clarity.