Im too lazy right now to check out what has been said in those links

But I am a pretty fresh kendama player as well so luckily i still have the techniques i have come across fresh in my mind - and dont take for granted the little things you gotta do just yet (im sure its second nature to the pro's). I will try and give you some detailed tips that may help!
Okay so first off with any kind of around the "___" tricks that end with spikes or require a spike somewhere in the combo; you need to try your best to get the ball in a spike-able position from the initial cup catch. After you have that down, you will have to focus on keeping the ball in that position as you toss it from cup to cup, leading to the spike.
This might sound like an impossible task, i know it did when i first started. The best thing to do (it will improve your playing overall) is to try and get the ball in the air and off the cup before you start to move your ken to its next position. A good way to describe this in words would be talking about orbits, which is how i found out this technique. If you watch Colin Sanders early edit videos you will be able to see him doing it, especially with orbits. The key is to not spin the tama whatsoever before its going to be in the air (so it doesn't roll around and change positions between cups). Knees are a crucial part of making this work properly (especially when first starting). Its rather difficult to describe it without actually being there to show you but hopefully this makes sense...
Practice some orbits and try not to let the ball spin when you get it up off the cup - once you got that down keeping the ball in a spikeable position shouldnt be too difficult.
Additionally, when you get more time under your belt you will start to get the eye of the tiger and will know which way you need to get the ball to spin (off the cup) to make the hole point in a favorable direction - or you can just be a boss and look at where the string hole is and try to spike it towards yourself or something

but thats still hard and awkward feeling for me so i dunno.