Short punchy kick, edge off sharp transients, compress and put a hp filter on the kick channel for later and create your bass in and around that kickdrum, See what you can get away with when the patterns are playing.
Look for a 'pocket' to sit the kick. In fact, the 2nd track you posted has the answers you seek in itself but you didn't look. At about 6:30 the kick drops out, notice that frequency now has no activity, there's a 'pocket'. If you run a spectrum analyzer on music, or anything you play on your computer you will get a better grounding on this kind of stuff.
In terms of patterns, they're only gonna do your head in if the elements are not working so besides that, don't worry about feeling the nedd to change bass patterns. Ostinato has been done to great effect for eons. You can change the FEEL of a pattern by other elements, where you might put a bass note, try putting a rimshot or a clave or whatever. A sound that encourages the pattern. Low subby basses dont need much more than positioning and then like Nhouz said, muffled elements to push and pull them - muffled because they will sound coherent with the low subby bass but if you tried to do that with just the bass, you ask too much.
So think of it like this: Your pattern is a rhythm, don't rush into your groove or pattern, spread it over a few different sounds and create a call and response vibe with your rhythms and your bass.