Mere details, do the points I've made still stand even if I got that detail incorrect? Of course they do.
Some of your other comments are OK, and you're warning that nerfing the KV8 could relegate them to Penal statis is true, but you are badly incorrect about P4 and that is a critical point.
Also FHT should arrive at around same time as guards or certainly after you have AT nades on conscripts. You can also place mines immediately as soviets to try to catch one as well.
Flames are hard to balance because of the flame crits they can inflict randomly. Without a steady stream of damage flames will always be able to randomly light a vet 3 squad up on the first burst. This is really a core issue.