Hello out there and maybe somebody can help me. I have a Mark V head with a 4x12 recto cab and am playing with a Jackson RR1 with seymour duncans. I have been extremely frustrated trying to get a real heavy metal tone. I can get kinda close with channel 3 with gain all the way up but it always seems to be muddy and lacks that melt your face dark heavy rhythym I was expecting from my boogie. I tried a hardwire metal distortion in front but it thins out the tone and has a brittle synthetic sound. Could it be my pickups? I also tried switching tubes, I put in some jjs el34s and that really helped but I cant seem to get it full and nasty. I am getting so frustrated that im almost ready to sell it at a loss or trade it. Maybe theres an effect pedal that can tighten it up and get more sustain? I really need some advice. I put out a huge wad of money for it and if I cant get the tone I want my wife will never let me forget it. I hope im just overlooking something. Thanks. Ps. Other than that it has the most beautiful clean tones. This is my first Mark