Beer can grip on the mag or hold it like a pistol mag are other options, you look like you're struggling with your grip on the bottom of the magazine. Whatever you decide, do it deliberately.
From what I saw you couldn't really make up your mind over how you wanted to hold the mag, and you're losing some control as a result.
Introduce dummy rounds in your mag diet, at :28 in video 1 you flinched pretty hard on the pistol.
That's an indicator of at least two things: 1) you are, 100%, positively, for-sure, moving without complete control over the pistol, i.e. you're out-running your headlights. 2) either you're unsure of your ability with the pistol or you're head is wrapped up in being filmed. My guess would be a combination of all three.
I like your use of mutliple rounds before a transition, keep that up, keep it random, keep it "new". Otherwise your brain might get imprinted with a response after a templated number of rounds, I've seen that happen and it is... ridiculous.
Pistol: Your working space is being mis-used when you bring the weapon closer to your body during reloads. Don't bring it back twelve inches when you only need three or four.
Don't forget to reload upon completing fire after a transition. If you shoot with others you would also be well-served to understand how to perform what's referred to as a "Check"
There's a simple drill called a "One-and-One", you guessed it: it's firing single round mags in pairs.
Fill your magazine carry system with single-round mags, load another single-round magazine.
On cue: fire, reload, fire.
I use a shot-timer but you don't have to.
Note: I say fill your entire magazine carry system with single-round mags, don't limit your practice to a single "strong" or "primary" magazine pouch. Specialization is for insects, you on the other hand... you'll want to keep your options open.
Next level:
If you want to get warmed up even more: use all of your magazines and alternate types of reloads.
For example: Telling a student to perform three emergency reloads and two tactical reloads. Then I'll have them do it a few times and eventually introduce stress in the form of a shot-timer.
Next level: Do it with multiple rounds in each magazine. Have a partner pack the mags with a random round count.
Next level: The same as above but with dummy rounds, not the first round and not the last round. You'll probably also want to introduce cover and joint pads at this point.
Shot timers are scary tools for most shooters because they always want to have fast times right off the bat.
Don't race the clock, do it right. Just use the clock to track your progress.
Even better, have a partner stand by with a stop-watch. It's cheaper and you have a spare set of eyes to help you out.
Otherwise: you look like you're having a good time.