When it comes to learning harmour, its good to read the manual and study the synthesis behind it, instead of just getting one person's take on the plugin.
As with any plugin, the more you know about what you can do with it, the better the results will be. So if there are a couple buttons that you don't know anything about, and Seamless doesnt cover them, then find out what you can do with them.
Image having Massive, but knowing what the Mod osc does, or how how to use macros. You would miss out on a big chuck of its potential. And that's the same for all other plugins.
Ive had a good look at granular synthesizers and have heard a lot of really good things, i'm sure you guys could learn a lot more about it with your own research.
Back on topic, different kinds of modulation like flangers and phasers can vary your sound in a very nice way, and compliment filtering very well.
Something a lot of the top neuro guys do, and this is common knowledge, is create basslines with choppod up bass samples. These bass samples usually contain a few bars of a heavily modulated phrase, which is then chopped and placed withing the rhythm of the break to create a working bassline. Making good basslines involves a auditioning and creative placement, and requires a good understanding of the 'question and answer' methods of chorus structure. A good thing to do is just take out a decent 8bar break loop and experiment with different basslines to see what works and help yourself get a better understanding.