Did you try setting the amp like it is in that video you posted? The R1 gain, R1 treble, and R1 presence can all add gain to that channel, based on their settings.
Looks like has has it set like this:
R1 Gain: 10, pulled
R1 Treble: 6.5
R1 Presence: 5
Plus it doesn't break up much until he...