Dudes, so I've been using the soft throw
https://www.youtube.com/watch?v=zqLCgbazuGs a whole bunch ever since I switched to the a-stick, and I just have to talk about it. Not just the fact that it's insanely good, but I wanted to make sure everyone knows how it works and also all of the different ways that it can be done. The vid linked above, while informative and amazing, is slightly off.
First of all, to clarify, the reason why the soft throw works has nothing to do with the slide back in the opposite direction making the throw somehow have less momentum or something. The only difference is in the arch that the Bomb travels when soft thrown forwards as opposed to being soft thrown backwards. When soft thrown forwards, the bomb has a slightly higher arch while when it is soft thrown backwards it is a flatter throw. To see proof of this, go to the stage Jungle Hijinxs, stand over to the right of the main stage, use the a-stick (or just the a button) to throw a bomb forwards towards the leafy platform on the right and it will land on the platform. Now turn around, and use the a-stick to throw a Bomb backwards towards that same platform and it will not land on it.
Because this tech has nothing to do with momentum going backwards, this means three things. The first is that, as alluded to above, you can just use the a-stick from a standing position and throw the bomb backwards and it will land on the ground. The second is that if you want you can do the input for the backwards JC throw instantly, such that it doesn't even look like you moved when in fact you turned around twice very quickly, and it will still work. Furthermore, it means that you can run or dash forwards, hit backwards, and then interrupt the beginning frames of your turn around animation with a JC throw back in the same direction and you'll still get the soft throw effect. If you already knew this, very good, I didn't until just then.
Now for the rant about how good this tech is. The soft throw means that you have an active hitbox out for much longer. While it is bouncing on the ground, it will explode on impact and pop up on shield, and obviously a moment later it will explode of its own accord. Having as many active hitboxes out for as long as possible at any one time is absolutely essential for overwhelming pressure spam. If your opponent is afraid to move or drop their shield, that's good. I like to think of these Bomb mines as being similar to Snakes Nades. Sure, Snakes nades had a larger hitbox and they did more damage and they could be grenade stripped, but Link's soft throw has an active hitbox that will explode on contact when thrown out and Link has a plethora of other tools to keep the pressure on. The zoning and pressure and stage control potential for this tech is actually ridiculous, and by gosh I just had to say something about it. I hope you didn't mind even if this was all old news to you.