I'm trying all Khatra styles, but use mainly sideways, which works just fine with the 40 lbs Kaya. With FW Khatra I somehow don't get a good arrow flight yet, and arrow goes down.. does not feel that good. Normally shoot 600 Spine 4.2mm ID, works just fine with the Kaya. . 400 spine warrior went to the right with not so good Khatra, but with better Khatra flies the same as the 600 spines. On the 30 lbs the 400 spines Warrior flies better than the 600 spines. Worst is a 5.2mm ID 600 spine which slaps really hard against the riser. Need to get better Khatra on this bow or maybe either stiffer or softer arrows. Just saw a nice video on this topic on YT by Bamboo Archery of Malaysia which explains the topic quite well. They also advise to try a more "dirty" release by twisting the string.. I'll try that tomorrow..
By any chance, do you post on the ATARN FB page?
For the record, there is only one khatra and that is what Taybugha describes in Saracen Archery. Much of what you describe being 'khatra' can be characterized as both erroneous and even superfluous.
Also, all this talk and worrying about spine drives me crazy. Really in Asiatic archery traditions, the arrow's relation to the bow was described in terms of its weight. You can hear Lukas Nuvotny speak of this here:
Something to consider: many great archers in the past would simply be able to flex the arrow in hand and based on that could determine how to shoot the arrow. Often times of any shape, size, length or weight. Ergo why some say its more important to 'be the arrow' in archery rather than the bow. Although realistically I do feel you need to know how both relate to each other and, to be quite honest, getting to that level where you can simply flex takes quite a bit of time, devotion, and practice. Unless you are an extremely fast learner and understand the bow enough to strictly 'become the arrow'.
What we can also take away from the above is don't overthink it when it comes to spine and that type of talk. I mean don't get me wrong. It has its importance, especially in the beginning. But to go on and on and on about it is just...mmmmm....tedious.
Most of what you will learn works will have to come from trial and error. This involves trying out many different types of arrows. No one will be able to effectively formulate what will work for you by simply discussing spine on any forum. It will likely only lead to further confusion. In the beginning, when I bought one of my first bows from Lukas, he gave me the exact same advice, that is to go out and experiment. I would say though definitely get you preferred draw length down in the beginning. You can vary things up here and there only AFTER that.
I myself usually don't think too much about spine and all that these days. Likewise, I also don't worry about twisting the string a billion times. But I've been doing this a while sooooo......
Be careful of what sources you check for info too. Lots of misinformation out there plus focus on the wrong things.