Priantz,
I've actually been subscribed to your channel for a while! Yes...the LV-4 is a very capable theremin and if you would listen to a recording only it would sound as good as anything out there 5 times the price. Also if you learned to play on it just think how easy it would be to play a Claravox once adjusted to the linear range. The volume response is what impressed me which is actually as good as my Hobbs and Subscope.
I noticed that you angle your antenna away from your right hand. I also found that to be helpful. I don't know if it improves the lineraty much but it certainly lowers the anxiety of accidentally touching it when in higher ranges. The only thing I think they should have done is make the case about the same length as the Etherwave.