Down-throw vulnerability scales the higher the opponents percent is too. It's more reliable to start tech chasing with sticky around 75% (too early for U-tilt to usually kill) where I believe Snake has +1 frame advantage (going off by memory here... please correct me if I'm wrong).
If they roll, follow their movement and sticky them. If they getup regularly, then sticky. If they getup attack, you can jump to avoid and then sticky when the attack ends. Again this is read dependent, but is a worthwhile punish if you notice they have a regular habit after they miss a tech. Ganon players know what I'm talking about
Remember that Back throw -> detonate sticky is a true combo, but just make sure your sticky doesn't transfer to you or falls off when you b-throw. If you get stuck in a transfer sticky battle, keep this in mind too.
Also regarding the sticky transfer, it cannot transfer nor fall off the opponent until the light stops blinking. I don't think it's been confirmed, but I believe that sticky can fall of more easily if the opponent is at lower percent (based on my experience this seems to be the case).
As soon as it stops blinking, sticky will be able to transfer and the red light blinks again when it transfers. And so on. It's not a bad thing necessarily though if you get into a transfer war. This can offer you some advantage whether your opponent notices or not; at the end of the day you're the one who has a finger on the detonation button, and you should use that to full advantage. If the opponent notices, then they're still going to be wary of that. If they don't... you get a free 20%+ damage at worst if they are not KO'd
Finally sticky will blow up by itself after approximately 28 seconds. I always try to make sure I'm the one who blows it up, or if not, then I'll try to bait my opponent to be close to it when I note the timer is close to passing 25 seconds.