Welcome to the forum, and love the screen name!
I mean, unresponsive wasn’t even a thing when Boingy Boing was created… Side note: anybody know who created it?
Sounds to me like you need to work on your throw most importantly. The XT is capable of way more than 10 seconds.
If you’re practicing as hard as you say, you can do it on an XT, no problem. If you persevere using the XT, you’ll be a better yoer for it in the end, at least in some respects.
My opinion, is work on your throw first, to get it straight and hard.
I agree with watching as many different tutorials as possible. The most important thing is repetition and rhythm with Boingy Boing. Don’t try to swing the yoyo forward and back. Just use an up and down motion with the hand on top.
Ultimately it will be just doing it over and over that gets it for you.
Unresponsive? Meh, the trick’s cooler with a loop to finish! I do love it on unresponsive yoyos too, not gonna lie.
Next: Pop 'n Fresh and Sea Sick!