VERY IMPORTANT NOTE:
Like with all HF PSK based modes it is very important for high data throughput in VARA not to overdrive your transmitter and hence create significant IMD products degrading your modulation.
There are plenty of tutorials on the internet explaining how to setup your station for e.g. PSK31 mode by watching the ALC meter of your radio very carefully. If you apply those settings to VARA, it should be working just fine and produce clean signals.
Find below two spectrum examples that I have taken live from QO-100:
One OM over-driving his TX in VARA mode and creating significant sidebands and resulting bad IMD as well as unequal amplitudes of the three PSK carriers of that VARA speedlevel.
Also as a reference see below how a clean signal looks like in comparison with more or less equal amplitudes of the three carriers and no overdriven sidebands.
73 de Oscar DJ0MY