Slight velocity changes can help. Slight tune changes. It also helps to have a few small sample variations and change between them. Slight swing. Also having something else other than HHs like a shaker can help.
As for the LFO, Hold can be nice to play around with.
Micro timing adjustments even if you finger drum, this can help add more swing and control. LFO applied to volume and tweak as you please. I believe Iāve seen a trick on ableton live that was applying an LFO to the filter frequency which gives it also a āfeelingā of dynamics.
I am myself spending the weekend practicing this stuff and making kits so I donāt have to start from scratch every time.
I like to layer the samples slightly with the analog engines so that it is barely noticeable, but the samples start to sound more organic.
Another trick is to put the pad on RTRG mode and record in live while varying the pressure on the pad, in this way I find the velocity variations more natural and it is easy to find a great groove.
Mix into a compressor or distortion. The bass drum should push the hihats out of the way. Insta-groove.
Have an LFO modulate the amp env attack. Insta-funk.
For hihats: LFO to decay time is a surefire way to add groove, almost like a shuffle without swing. Adding 75% probability to trigs that arenāt on the downbeat helps. A little velocity and pitch adjustment per note on top of that and youāre golden.
As you said āhumaniseā, it made me think ādonāt play straight 16thsā. Itās very rare to find a human drummer play that pattern. They usually mix closed and open hats, or they play ghost snares on some of the 16ths, rather than closed hats. Sometimes they alternate tiny snare hits and closed hats. Iām not sure, but maybe they also do that bounce trick on closed hats (where they strike down once, allow the recoil to push the stick up and then use a slight finger pressure to push the stick down again)? With the bounce, the alternating strikes will sound slightly different because one has the full arm force behind it, and the other the looser finger force. Itās also harder to do, so every other note will have higher chance of microtiming changes.
I also really like randomizing the start point of a sample. Does wonders even to the most precisely repeating 16ths hats.
It doesnāt really add groove, but it removes some (perceived?) resonances that build up because of the quick repition. Alongside some amp and filter envelopes, especially the attack/transient of the hat can vary pretty wildly, while keeping the tail intact.