Actually although it says 100% even when you miss sliders, technically counts still as a miss, for example you won't get the combo achievement if you miss even one slider star/dot but it's really not something to worry about too much, majority of taiko-specific maps have very few sliders, since you're coming from osu!standard I imagine you're playing converted betamaps, they may be good for pp farming but the patterns are a mess, some 4* maps are close to impossible to FC because of that even thought they're just 4 stars.
Anyway, if your eye is fast enough to read the stars/dots on sliders, just think of them as more circles to hit, very close circles without color, hitting them to the rhythm like babysnakes recommended usually works well on them, I'd alternate dk.
big circlesBy the way, big circles need to be hit with both buttons of the same color, don't ignore them or you'll lose a LOT of points. I'm telling this because you're new to taiko and when I was new I didn't know much about the original taiko and I played for a long time losing all those good potential points...
What skin do you use? I made 2 custom png for sliders to make them a bit larger if you need, it works for me (on 1080p res at least):