Ez Secretagentgel!
What about bok bok's refix of your tune

?
You don't mention Lil Silva, but I assume you know his tunes anyway, as he is THE grimiest. Different, Seasons, Burnin etc.
But check his new joint with Ms Bratz of Lava Unit, called "Who do you think you are" Amazing.
I also assume you know Hard House Banton, but he's just put out a refix of some Vinyl Vixens tunes which are HARD. Not necessarily in a Grime way, though. Check them.
And N.B Funky, yes? He's got a new track "The Leak" which is big. But apart from the ubiquitous Riddim Box, 2nd Strike VIP is heavy
Check out "Shoulder Low" by Dafro. Lyrics are a bit suspect but that beat must be EXACTLY what you're talking about. Sick.
K.I.G's new joint, "Bringing it Down" is a speed-garage sampling, grime-esque lyrical badman tune. Nuff kick drums per bar.
Check T2's Funky Remix of his own tune "Secrets" and DJ Q's "Yours" for a bassline meets funky tip. And DJ Q has also refixed SIA's Little Man! Dexplicit's even got one out, but I feel it may be too sexy for you
Fingaprint tunes are HEAVY. Night time is ESPECIALLY heavy. Grimey, even. Check Fingaprint's remix of Takeover, which even samples Doin it agen!
Attaca Pesante has a tune called Russian Roulette which is PURE grime string banger, much along the lines of Sticky's Jumeirah riddim, but less organic sounding (thankfully)
Ill Blu's tunes are HARD. But not sure how you'll sit with the vocals...
Check MJ cole's Funky Dub of his tune "Gotta Have It".
Footloose - That's Gangsta is BADDDD, well grimey. On that tip check the Funky remix of Sketpa's rolex sweep and
Footsteps also has a ridiculous tune called Green Light, which is grimey and tribal.
BUT bear in mind
You're missing out on a lot of good music if you don't start rating the sexy stuff

It's not grimey, but it's still hard!!
Hope that helps!