Recently, my two Trompo Grande tops had the tips go loose. Jack kindly told me that to cut a square from a shipping bag, then press the tip and patch into the top. Excise the rest. Problem solved! Super happy and super simple.
In your case, I think you have a defective from the get-go top. Sorry. I think your best bet is to contact YoYoSam.
Odds are I'm actually going to use my Trompo Grande tops for when I get ready to fully explore and learn regens myself. As they are a little larger than many of my tops, I think it might be easier. Just in my work on lasso from hand using bearing tips, I am finding that size really doesn't matter, just well practiced.
It might be time for me to order another couple of these tops. I do like them.