Nice to get a good critical ear to this further down the line from when I last heard it.

First thing I notice is the kick.
too loud in the mix, and lacking a little sub.

There`s a lot of inbalance between sounds, and a lot of the synths are too low in the mix.

I wouldn`t say "phatness" is the problem so much as volume, and maybe slightly too agressive EQing on your sounds as the low end on a lot of things seems to be cut down too much.

A use of nice warm reverb use just subtley on some of the sounds might also gel things together and give a little more presence, especially to the percussion.

I`d also say the acid is a little raw, and again lacking fullness. Although I know it was produced digitally, it sounds like it.
The 303 needs more size in the low regions, maybe a little chorus to add some warmth and size, and maybe a touch of reverb or delay too, just to get it all sounding more like a proper silver box.

Once the sounds are all brought into balance more effectively this could end up being a nice high energy bit of acid with a slightly classic london tinge.