How long have you been using Massive? Most of it is understanding what sounds good in Massive vs what sounds good with the song. Plenty of times in the past I've created an awesome bass in Massive, only to find it doesn't fit the song.
First off (IMO), Performer and Stepper > LFOs. LFOs are for steady wubs, Performers and Steppers are for glitchy bass lines, and with the ability to crossfade and/or switch lines, you can have up to 8 separate Stepper and Performer lines all within one sound.
For some general tips though:
- It's better to use 1 or 2 oscillators max, rather than all 3. Adding more oscillators just adds more tweaking to get the right sound.
- Phase and Ring Mod oscillation is your friend.
- Play around with the built in EQ.
- Remember, your drums go with your bass. A dubstep drop with a standard rock rhythm isn't a dubstep drop. Your drums should be as fluidly changing as your bass, in a way that compliments the bass line.
Listen to this tune, and instead of focusing on the bass, listen to how they do the drums, how they compliment the bass, etc.
http://www.youtube.com/watch?v=-u0t8ZIlwuQ