I have an Artisan 15 and although I really like the tone of this amp I don't like it when it breaks up. I find the distortion to be stiff and harsh. It's unpleasant to me whether it's the amp turned up and distorting or with an overdrive pedal pushing the amp. I changed the speaker for a Red Fang. This softened the attack slightly and improved the overall tone IMO. I would like the amp to have more sag (sponginess, brownness). The amp is hand wired and I would think would be easy to mod. Is it possible to add sag or should I just start shopping for a new amp?