Thanks for these @eljodon been looking forward to these. Should be right up my street as I've had very similar issues trying to make direct profiles of my Marshall 1980 JMP 2203, just comes out really thin and tinny with the definition setting itself at around 0.3!. Only had the odd few minutes at rehearsal to quickly try and take a couple of profiles whilst deafening everybody so I never really got time to look into the issue in more depth.
The Marshall is away getting modded with a PPIVM with zenner diode clipping, resonance pot, a "definition" pot and and footswitchable extra valve gain stage on top of the valve fx loop and solo boost it already has in so it should be great when I get it back in the next week or two.