Good pics. Its hard to tell but how high are your gains turned up and judging by the hi-pass setting, I assume you are not using the bass boost correct?
Check to make sure your power and grounds at the amp are tight and also the ground where it is grounded to the car/truck.
Keep in mind that this amp is a class a/b so it will run hot. Even more so with the 2 ohm load on the front ch.
How hot is it actually? Can you still touch it and keep your hand on it? I take it that it has not gone into thermal protect?
To give you an idea, I have an old Crossfire CFA HC30 bridged running at 1ohm(in hi-current mode) and after a bit, it gets quite hot.
Just the nature of some amps.