In my experiences, I’m getting over 10 points on nearly every dino I’m fusing save a few I haven’t got lucky enough to gauge when to hit the button. Just remember to be patient & observant. Don’t be in a hurry. The only time I hit the button immediately is after I’ve lost my “timing” & want to start the “pattern” over (more on that later). Let me share with you my observations for ankylocodon (which I’ve had decent success with) as the timing point (at least for me) is relatively easy to spot:
her animation cycle begins with a roar after she raises her head. She then fidgets for a second or so & prances a bit. Watch carefully & you will see her sort of punch her snout downwards, forward, & then up again (kind of like a “shoveling” movement) after which she roars & the pattern repeats again. It is on this downward “shoveling” movement I hit the button. Note that if you miss this first opportunity, I recommend you eXit out & go back in to start over as it doesn’t always work deeper into the animation cycle. In fact, I recommend this exit & return strategy to reset an animation cycle each time after getting two or three tens in a row on any dino. Good luck in searching out the key timing movements in others. If you’re getting tons of tens anyway, you really don’t have anything to lose.