Any ideas how to make the acid sound in this track?

To me it sounds like a formant saw run through a filter with a lot of resonance. I don't know how Sylenth works, so I hope you can just manage to get it right with just me explaining.

I don't know about formant in Sylenth, so I'll assume it's there. You should use a formant saw and make it so the formant isn't too intense and you can hear the pitch of the note. After that, run it through a lowpass or acid filter and turn the resonance up pretty high. If you modulate the cutoff while a note plays, it gives you a plucky acid sound that should have the characteristics of the sound in the track.
 
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