This is great that you're doing this. You are learning so much about your hair through data collection and observation. By the time you get ready to do your starter locks, you will have a definitive guide for how to get started, how they will behave, and how to take care of them based on all of your research.
One of the unique characteristics of mini/micro twists is just what you described. Every time I used to do a set on my loose hair years ago, I loved that about them. They truly do feel light and airy, and look so pretty and full once they dry and as the days progress.
Remind me, how long is your hair? Bunching can happen anywhere along the length of the locks, but it's more common for it to happen near the ends, if that makes sense. It's also not as severe/pronounced on shorter hair. Since you are still practicing with mini-twists, a good way to prevent that until you're ready to lock is to braid and/or band the twists before you wash them or wet them.
You can also get different looks from this process once your hair is dry and you undo the braiding and banding.
When you start your locks, I don't think a locking gel is necessary (for the hair to lock) but you'll probably want to use something for hold and to get the twists to stay and not unravel. It's really going to come down to what you prefer. Some people generally use some type of product (s) when they start their locks, while others don't use anything at all, or just oil and water. Whatever you choose, make sure you choose something that will wash out of your hair and not cause buildup, flakes, or residue. Something clear is best. Also, try not to be heavy handed.
I used Long Aid Curl Activator Gel (the green label) and my spray mix of Infusium-23 leave in, water, and peppermint essential oil to start my locks and I started with two-strand twists.
This rinsed out fine whenever I did my first wash. I'm sure I didn't "need" to use it, but I felt like I wanted my hair to be neat initially starting out. I also used it because I needed to define my curls and have them clump together because I used the curl parting method to determine my lock size and parts.
I can't remember if I posted these upthread already, but here are the 2 videos I used for reference. I did NOT do the maximum hydration method before I started my locks. Ain't nobody got time for that.
Plus, I understood that my hair was going to become "deconstructed" during the locking process, so it didn't make sense for me to load it down with all these products and steps.
This is Kyra at 15 months and 3 years later, respectively:
Her hair in that 3 year update is EVERYTHING!!!! So drool worthy and healthy looking.
For some reason, I can't find Trinity's updates, even though I'm sure I've seen them before.
They also influenced me to do primarily water-washing only.
I had a lot more I wanted to say, but I had to stop composing this post to get my son ready for bed. Now that he's settled, I have to recollect my thoughts. I'm all for the nose ring, though.