You have to take fuel endurance into account as well. An SV-51 might have a similar max thrust rating but it's going to burn through it's fuel blindingly fast. Most modern fighter jets have an afterburner endurance of about 10min max till bingo fuel, now take that rating and cut it in half for the OT engines.
I guess the MacZero engines are supercruise like the F22 though so they might have a combat endurance of 20 minutes or so in fighter mode.
Less if Gerwalk or Battroid are used as they pretty much require afterburner use.
A VF-1 on the other hand can just keep it's engine cranked up to max in an atmosphere for an indefinite time. A SV-51 might be able to keep up with a VF-1 in the first few minutes after engagement but will very quickly fall behind due to fuel restrictions.
Btw, the verniers would have to be very, very powerful to work in an atmosphere on a plane with control surfaces. At slow speeds verniers might prove useful, sort of like ultra-vectored thrust. But at high speeds the air acting on the control surfaces might be too powerful to overcome in any meaningfull amount.
There's a reason why vectored thrust is great for post-stall situations.