I just went through this with going to a power amp and cab.
If you are missing the low end chug, try this:
- Take off noise gate or lower threshold (make be squeezing tone too much)
- Turn off drive block ( assuming this...)
- 12 o'clock your tone controls on amp block, drive to taste.
- Add a GEQ block after your amp or at the very end of signal chain.
- EQ something like this:
0 to 31
+3 db's to 63
+3 to 125
+3 to 250
-2 to 500
-2 to 1k
-1 to 2k
-2 to 4k
0 to 8k
0 16k
- Now EQ your amp block, add back noise gate to taste, and drive to taste.
If that doesn't fix your chug, scoop more mids from eq block.
The GEQ is more of a clean eq and doesn't affect the character of the amp, as changing eq of amp bock will alter the sound/character of amp head.
Hopefully that will help. If not, faulty power amp, lol.