Ok, I don't do wc anymore sorry but I have done enough to appreciate the applications from a simple level. Having done TKD and karate for almost twenty years I have a bit of experience in kicking, low and high.
In my experience, the focus should not be so much on the non-telegraphed/shadow/invisible kick etc but on timing. Aside from in close low kicks and knees while in combination with boxing and grappling, your kick is one of the most telegraphed attacks there is. Particularly such as your round house kick from the back leg. There is no way an experienced fighter who is also versed in kicking is not going to pick up on this from a static environment.
The beauty of such lethal and powerful attacks is in their execution with timing: you work some in-close combos, you rock your opponent with a quick jab, or they step out from their own attack and then, wham, as they are moving or retracting you are already expanding (Bruce Lee talk there, sorry) into them.
I have fought in quite a few muay thai competitions so appreciate the roundhouse off the back leg for pure power but being a karetaka have always favoured the front kick; be it a snap kick or hook kick. This is much easier to mask when done correctly. From the front foot it is much closer to your opponent's head anyway (while you are just out of range of punches). As said before, if you throw a straight or jab and as retracting flick up your front kick, moving and chambering your front knee directly up the centre line this can be very hard to see coming. The leg actually moves up under the opponent's chest/chin and then the kick (be it face of foot or shin) snaps up to the side of the head/temple/jaw (or hook from the alternative side with heel connection).
Of course, again, when fighting an experienced opponent you need to work this in with timing. It sounds crazy but sometimes even slowing the first part of this kick down (in bringing the knee up) works beautifully when timed right as you then whip/snap the kick out at a totally different tempo.
Don't get me wrong. I try everything I can not to telegraph also - but it is the fighter with great timing that will be one of your worst and hardest fights.
On a training note, if not already, why not complement what you are doing with timing training with moveable targets (double-end bag/bounce-back bag) and training partners.