High velocity flame using Mantaflow problem

Hi all!
I’m trying to create rocket engine flame for some SLS launch shots and I have a problem with Mantaflow. I need this fire to be very energetic, fast burning and powerful so I tried to set up high Initial Velocity parameter (I started with value of 5 in Normal section). Unfortunately, I see some weird behaviour. Here is comparison how it looks like if Initial Velocity is set to 1 and 5: https://imgur.com/yjJg7mO
I decreased “Reaction Speed” parameter in Domain settings to 0.1, I also set “Flow Behavior” to Inflow and increased Fuel to maximum value of 10 (here is the result of this last parameter: https://www.youtube.com/watch?v=dRXIrHqq7lQ&feature=youtu.be.
What I’m doing wrong? Is it possible to create this type of simulation in Mantaflow in Blender 2.82a?