If you want to have generic dubstep, you need more metal like sounds (adding a chorus and delay will do) and add harsh growls as filler basses. Cut the under 50hz frequencys with an EQ and add a sub to fatten it up. Use some hovering Supersaw Chords and an Arpeggiator to make it sound less empty. Get the 4/4 drum patern add some percs and splashes and your drop should be finished(Dont make the hats too loud or it will end up as brostep).
Basically Dubstep is defined, as you said, by its tempo between 135 bpm to155 bpm and its 4/4 Kick, Snare pattern. Listeners mosly dont know how to define a genre and will call everything dubstep even if its drumstep when it istnt full of hard basses.
Lesuperchef
I've listened to your track Radium 2, and I can see the problem. I'ts really good, but it doesn't sound much like dubstep. Here's a few things I can suggest to make it sound more like dubstep *(Keep in mind I'm not an ace in dubstep)* :
1) Make the drums louder. Most of the time, a good dubstep song explodes your headphones ;)
2) Make sure you have a good build-up before the drop. Generally, just keeping the same chord for a few measures and control the rhythm with the kick (or snare) going faster and faster can help.
3) At the drop, make sure the growl/wubs/whatever dubstep instrument(s) you are using cover the harmonic instruments, and keep the same chord througout the drop.
4) To leave the drop (optional), you remove all or most of the stuff that busts your ears and go back to a similar stucture as it was before the drop.
5) Generally, a dubstep song has two drops. You can put three or only one, depending on your amount of ideas, but make sure all of the following drops add something more, just enough to be surprising for the average listener.
The last tip I can give you is to regularly listen to dubstep. That way, you will easily recognize some tricks the dubstep composers use in their songs.
I hope I helped :)