Yeah, velocity is one of the most important things people over look while laying down drums, I just learned that myself a few months ago. Here are a few things I've been doing to humanize my drums a little:
Variation! You'll never hear a real drummer play the same beat for the whole song, most won't even play the same fill twice, so don't just make a four bar loop and copy/past it over the rest of your track. Little switch ups every few bars can add more energy, keep the beat interesting and make it sound like there's someone behind the drums playing by feeling.
Don't quantize anything! If you've got the time and patience, make an 8 or 16 bar loop by just placing the samples by hand. No quantize, copying, or zooming super far into the grid, just throw everything down as best as you can. You can copy that loop after, make some changes, etc. That'll loosen things up a whole bunch. I like this on 4x4 kick patterns especially.
One little trick I use a lot in Reaper to add additional timing variations/humanization on my hi-hats without doing too much work is to throw the au sample delay
plug-in on my hi-hat track, go into the automation options and select "in/out delay" in the sample delay plug-in, then select the modulate option in the automation lane and check "lfo". Once you're in the lfo section, choose the random waveform, set the base value to the very bottom, the speed to taste (I usually sync it to 64ths) and the strength fairly low (unless you want the effect to be extremely noticeable). This delays the sample by random amounts (milliseconds... subtle but still very effective) and loosens up your drums even more.
One last thing, do all the swinging/shuffling yourself. It's much more fun than just clicking a preset, and you can get some really neat sounding patterns if you experiment.
Hope this helped
I wanted to make a good first impression haha
EDIT: If you want to hear some examples, just let me know and I'll send you some newer stuff I'm working on in which these techniques are used more extensively than on the tracks I've released already.